Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 567	$ 775
Gross Amounts Offset in the Consolidated Statements of Financial Position	(411)	(601)
Derivative assets, net	156	174
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(533)	(770)
Gross Amounts Offset in the Consolidated Statements of Financial Position	405	601
Derivative liabilities, net	(128)	(169)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	233	355
Gross Amounts Offset in the Consolidated Statements of Financial Position	(156)	(266)
Derivative assets, net	77	89
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(223)	(351)
Gross Amounts Offset in the Consolidated Statements of Financial Position	151	266
Derivative liabilities, net	(72)	(85)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	180	306
Gross Amounts Offset in the Consolidated Statements of Financial Position	(120)	(225)
Derivative assets, net	60	81
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(168)	(298)
Gross Amounts Offset in the Consolidated Statements of Financial Position	125	225
Derivative liabilities, net	(43)	(73)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	154	113
Gross Amounts Offset in the Consolidated Statements of Financial Position	(135)	(110)
Derivative assets, net	19	3
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(137)	(121)
Gross Amounts Offset in the Consolidated Statements of Financial Position	129	110
Derivative liabilities, net	(8)	(11)
Interest rate contracts
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	0	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative liabilities, net	0	0
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	0	1
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative assets, net	0	1
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(5)	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative liabilities, net	$ (5)	$ 0

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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