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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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