Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 781	$ 775
Gross Amounts Offset in the Consolidated Statements of Financial Position	(611)	(601)
Derivative assets, net	170	174
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(746)	(770)
Gross Amounts Offset in the Consolidated Statements of Financial Position	611	601
Derivative liabilities, net	(135)	(169)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	282	355
Gross Amounts Offset in the Consolidated Statements of Financial Position	(204)	(266)
Derivative assets, net	78	89
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(278)	(351)
Gross Amounts Offset in the Consolidated Statements of Financial Position	204	266
Derivative liabilities, net	(74)	(85)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	313	306
Gross Amounts Offset in the Consolidated Statements of Financial Position	(242)	(225)
Derivative assets, net	71	81
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(317)	(298)
Gross Amounts Offset in the Consolidated Statements of Financial Position	242	225
Derivative liabilities, net	(75)	(73)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	179	113
Gross Amounts Offset in the Consolidated Statements of Financial Position	(163)	(110)
Derivative assets, net	16	3
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(149)	(121)
Gross Amounts Offset in the Consolidated Statements of Financial Position	163	110
Derivative liabilities, net	14	(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)	7	1
Gross Amounts Offset in the Consolidated Statements of Financial Position	(2)	0
Derivative assets, net	5	1
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(2)	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	2	0
Derivative liabilities, net	$ 0	$ 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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