Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 388	$ 652
Gross Amounts Offset in the Consolidated Statements of Financial Position	(265)	(498)
Derivative assets, net	123	154
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(372)	(657)
Gross Amounts Offset in the Consolidated Statements of Financial Position	265	511
Derivative liabilities, net	(107)	(146)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	190	357
Gross Amounts Offset in the Consolidated Statements of Financial Position	(119)	(256)
Derivative assets, net	71	101
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(192)	(378)
Gross Amounts Offset in the Consolidated Statements of Financial Position	119	263
Derivative liabilities, net	(73)	(115)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	181	285
Gross Amounts Offset in the Consolidated Statements of Financial Position	(146)	(241)
Derivative assets, net	35	44
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(180)	(275)
Gross Amounts Offset in the Consolidated Statements of Financial Position	146	246
Derivative liabilities, net	(34)	(29)
Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	15	9
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative assets, net	15	9
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	0	(1)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	1
Derivative liabilities, net	0	0
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	2	1
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	(1)
Derivative assets, net	2	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	0	(3)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	1
Derivative liabilities, net	$ 0	$ (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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