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Segment and Related Information - Income Statement Data (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Revenues from external customers |  | $ 1,173 | $ 1,091
Operating income (loss) |  | 311 | 178
Operating Segments | East |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Revenues from external customers | [1] | 1,096 | 1,047
Operating income (loss) |  | 392 | 231
Operating Segments | West |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Revenues from external customers | [1] | 77 | 44
Operating income (loss) |  | (28) | (1)
Other |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Operating income (loss) |  | $ (53) | $ (52)
[1] | Includes unrealized gains and losses from derivatives. See Note 13 for additional information.

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