Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 775	$ 663
Gross Amounts Offset in the Consolidated Statements of Financial Position	(601)	(530)
Derivative assets, net	174	133
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(770)	(669)
Gross Amounts Offset in the Consolidated Statements of Financial Position	601	513
Derivative liabilities, net	(169)	(156)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	355	349
Gross Amounts Offset in the Consolidated Statements of Financial Position	(266)	(277)
Derivative assets, net	89	72
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(351)	(380)
Gross Amounts Offset in the Consolidated Statements of Financial Position	266	272
Derivative liabilities, net	(85)	(108)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	306	303
Gross Amounts Offset in the Consolidated Statements of Financial Position	(225)	(252)
Derivative assets, net	81	51
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(298)	(285)
Gross Amounts Offset in the Consolidated Statements of Financial Position	225	240
Derivative liabilities, net	(73)	(45)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	113	7
Gross Amounts Offset in the Consolidated Statements of Financial Position	(110)	(1)
Derivative assets, net	3	6
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(121)	(1)
Gross Amounts Offset in the Consolidated Statements of Financial Position	110	1
Derivative liabilities, net	(11)	0
Interest rate contracts
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	0	(3)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative liabilities, net	0	(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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