Investments - Equity Method and Joint Ventures Investments - Equity Method and Joint Ventures table (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
||||||
| Schedule of Equity Method Investments | |||||||||
| Balance at December 31, 2015 | $ 58 | ||||||||
| Effect of deconsolidation (a) | [1] | 295 | |||||||
| Equity in earnings | [2] | $ 3 | $ 2 | 10 | $ 6 | ||||
| Distributions received | (21) | ||||||||
| Balance at September 30, 2016 | 342 | 342 | |||||||
| Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 137 | 137 | |||||||
| Cumulative Effect on Retained Earnings, Net of Tax | 2 | ||||||||
| Rendezvous Gas Services, L.L.C. | |||||||||
| Schedule of Equity Method Investments | |||||||||
| Balance at December 31, 2015 | 0 | ||||||||
| Effect of deconsolidation (a) | [1] | 295 | |||||||
| Equity in earnings | 6 | ||||||||
| Distributions received | (16) | ||||||||
| Balance at September 30, 2016 | 285 | 285 | |||||||
| Three Rivers Gathering, L.L.C. | |||||||||
| Schedule of Equity Method Investments | |||||||||
| Balance at December 31, 2015 | 42 | ||||||||
| Effect of deconsolidation (a) | [1] | 0 | |||||||
| Equity in earnings | 2 | ||||||||
| Distributions received | (3) | ||||||||
| Balance at September 30, 2016 | 41 | 41 | |||||||
| Uintah Basin Field Services, L.L.C. | |||||||||
| Schedule of Equity Method Investments | |||||||||
| Balance at December 31, 2015 | 16 | ||||||||
| Effect of deconsolidation (a) | [1] | 0 | |||||||
| Equity in earnings | 2 | ||||||||
| Distributions received | (2) | ||||||||
| Balance at September 30, 2016 | $ 16 | $ 16 | |||||||
| |||||||||