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| In millions, except per share items | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues | | | | | | | | |
| Commodity sales | 6,858.5 | 6,098.3 | 10,725.0 | 10,549.2 | 9,010.2 | | | |
| Services | 2,060.0 | 1,662.7 | 1,466.7 | 1,320.1 | 1,172.0 | | | |
| Total revenues | 8,918.5 | 7,761.1 | 12,191.7 | 11,869.3 | 10,182.2 | 11,322.6 | 8,675.9 | 6,474.5 |
| Total revenues growth | 14.9% | -36.3% | 2.7% | 16.6% | -10.1% | 30.5% | 34.0% | -16.1% |
| Cost of sales and fuel (exclusive of items shown separately below) | 6,496.1 | 5,641.1 | 10,088.5 | 10,222.2 | 8,540.3 | 9,745.2 | 7,531.0 | 5,355.2 |
| Operations and maintenance | 639.5 | 609.1 | 599.1 | 464.6 | 433.1 | 414.5 | 363.5 | 361.6 |
| Depreciation and amortization | 388.6 | 352.2 | 291.2 | 236.7 | 203.1 | 177.5 | 173.7 | 164.1 |
| General taxes | 88.0 | 83.1 | 70.6 | 56.9 | 49.5 | 44.9 | | |
| (Gain) loss on sale of assets | -9.9 | -6.1 | -6.6 | 11.9 | 6.7 | -1.0 | 18.6 | 2.7 |
| Operating income | 1,316.1 | 998.1 | 1,148.8 | 900.7 | 962.9 | 939.5 | 586.3 | 546.6 |
| Operating margin | 14.8% | 12.9% | 9.4% | 7.6% | 9.5% | 8.3% | 6.8% | 8.4% |
| Equity in net earnings from investments (Note I) | 139.7 | 125.3 | 117.4 | 110.5 | 123.0 | 127.2 | 101.9 | 72.7 |
| Allowance for equity funds used during construction | 0.2 | 2.2 | 14.9 | 30.5 | 13.6 | 2.3 | 1.0 | 26.9 |
| Interest expense | -366.8 | -338.9 | -281.9 | -236.7 | -206.0 | -223.1 | -204.3 | -206.0 |
| Income before income taxes | 1,086.2 | 602.0 | 924.0 | 814.8 | 898.5 | 843.5 | 488.4 | 447.7 |
| Income taxes | -13.9 | -4.1 | -12.7 | -10.9 | -10.1 | -12.6 | -15.1 | -13.0 |
| Net income | 1,072.3 | 597.9 | 911.3 | 804.0 | 888.4 | 830.9 | 473.3 | 434.7 |
| Less: Net income attributable to noncontrolling interests | 5.5 | 8.3 | 1.0 | 0.4 | 0.4 | 0.6 | 0.6 | 0.3 |
| Net income attributable to ONEOK Partners, L.P. | 1,066.8 | 589.5 | 910.3 | 803.6 | 888.0 | 830.3 | 472.7 | 434.4 |
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| Limited partners' interest in net income: | | | | | | | | |
| Net income attributable to ONEOK Partners, L.P. | 1,066.8 | 589.5 | 910.3 | 803.6 | 888.0 | 830.3 | 472.7 | 434.4 |
| General partner's interest in net income | -423.5 | -394.6 | -344.2 | -275.5 | -227.9 | -147.8 | -118.2 | -96.4 |
| Limited partners' interest in net income | 643.3 | 195.0 | 566.1 | 528.1 | 660.1 | 682.5 | 354.5 | 337.9 |
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| Limited partners' net income per unit, basic and diluted (Note H) | $2.25 | $0.73 | $2.33 | $2.35 | $3.04 | $3.35 | $1.75 | $1.80 |
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| Number of units used in computation (thousands) | 285.8 | 267.3 | 243.3 | 224.7 | 217.1 | 203.8 | 202.7 | 187.6 |
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