Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 565	$ 663
Gross Amounts Offset in the Consolidated Statements of Financial Position	(406)	(530)
Derivative assets, net	159	133
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(572)	(669)
Gross Amounts Offset in the Consolidated Statements of Financial Position	410	513
Derivative liabilities, net	(162)	(156)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	235	349
Gross Amounts Offset in the Consolidated Statements of Financial Position	(170)	(277)
Derivative assets, net	65	72
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(236)	(380)
Gross Amounts Offset in the Consolidated Statements of Financial Position	170	272
Derivative liabilities, net	(66)	(108)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	320	303
Gross Amounts Offset in the Consolidated Statements of Financial Position	(236)	(252)
Derivative assets, net	84	51
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(321)	(285)
Gross Amounts Offset in the Consolidated Statements of Financial Position	240	240
Derivative liabilities, net	(81)	(45)
Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	9	7
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	(1)
Derivative assets, net	9	6
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
Interest rate contracts
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(15)	(3)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative liabilities, net	(15)	(3)
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	1	4
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative assets, net	$ 1	$ 4

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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