Financial and Other Derivative Instruments Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 764	$ 1,178
Gross Amounts Offset in the Consolidated Statements of Financial Position	(650)	(1,006)
Net Amounts of Assets Presented in the Statements of Financial Position	114us-gaap_DerivativeAssets	172us-gaap_DerivativeAssets
Gross Amounts of Recognized (Liabilities)	(770)	(1,110)
Gross Amounts Offset in the Consolidated Statements of Financial Position	695	1,025
Net Amounts of (Liabilities) Presented in the Statements of Financial Position	(75)us-gaap_DerivativeLiabilities	(85)us-gaap_DerivativeLiabilities
Natural Gas
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	443	787
Gross Amounts Offset in the Consolidated Statements of Financial Position	(389)	(681)
Net Amounts of Assets Presented in the Statements of Financial Position	54	106
Gross Amounts of Recognized (Liabilities)	(455)	(718)
Gross Amounts Offset in the Consolidated Statements of Financial Position	428	679
Net Amounts of (Liabilities) Presented in the Statements of Financial Position	(27)	(39)
Electricity
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	270	342
Gross Amounts Offset in the Consolidated Statements of Financial Position	(215)	(280)
Net Amounts of Assets Presented in the Statements of Financial Position	55	62
Gross Amounts of Recognized (Liabilities)	(262)	(342)
Gross Amounts Offset in the Consolidated Statements of Financial Position	217	298
Net Amounts of (Liabilities) Presented in the Statements of Financial Position	(45)	(44)
Other
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	43	45
Gross Amounts Offset in the Consolidated Statements of Financial Position	(42)	(42)
Net Amounts of Assets Presented in the Statements of Financial Position	1	3
Gross Amounts of Recognized (Liabilities)	(46)	(45)
Gross Amounts Offset in the Consolidated Statements of Financial Position	46	45
Net Amounts of (Liabilities) Presented in the Statements of Financial Position	0	0
Other derivative contract
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	8	4
Gross Amounts Offset in the Consolidated Statements of Financial Position	(4)	(3)
Net Amounts of Assets Presented in the Statements of Financial Position	4	1
Gross Amounts of Recognized (Liabilities)	(7)	(5)
Gross Amounts Offset in the Consolidated Statements of Financial Position	4	3
Net Amounts of (Liabilities) Presented in the Statements of Financial Position	$ (3)	$ (2)

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

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