Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 580	$ 775
Gross Amounts Offset in the Consolidated Statements of Financial Position	(486)	(601)
Derivative assets, net	94	174
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(564)	(770)
Gross Amounts Offset in the Consolidated Statements of Financial Position	460	601
Derivative liabilities, net	(104)	(169)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	240	355
Gross Amounts Offset in the Consolidated Statements of Financial Position	(194)	(266)
Derivative assets, net	46	89
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(265)	(351)
Gross Amounts Offset in the Consolidated Statements of Financial Position	185	266
Derivative liabilities, net	(80)	(85)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	137	306
Gross Amounts Offset in the Consolidated Statements of Financial Position	(106)	(225)
Derivative assets, net	31	81
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(126)	(298)
Gross Amounts Offset in the Consolidated Statements of Financial Position	104	225
Derivative liabilities, net	(22)	(73)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	201	113
Gross Amounts Offset in the Consolidated Statements of Financial Position	(186)	(110)
Derivative assets, net	15	3
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(171)	(121)
Gross Amounts Offset in the Consolidated Statements of Financial Position	171	110
Derivative liabilities, net	0	(11)
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	0
Derivative assets, net	2	1
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(2)	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative liabilities, net	$ (2)	$ 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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