Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 560	$ 567
Gross Amounts Offset in the Consolidated Statements of Financial Position	(450)	(411)
Derivative assets, net	110	156
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(652)	(533)
Gross Amounts Offset in the Consolidated Statements of Financial Position	444	405
Derivative liabilities, net	(208)	(128)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	163	233
Gross Amounts Offset in the Consolidated Statements of Financial Position	(106)	(156)
Derivative assets, net	57	77
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(246)	(223)
Gross Amounts Offset in the Consolidated Statements of Financial Position	108	151
Derivative liabilities, net	(138)	(72)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	138	180
Gross Amounts Offset in the Consolidated Statements of Financial Position	(100)	(120)
Derivative assets, net	38	60
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(150)	(168)
Gross Amounts Offset in the Consolidated Statements of Financial Position	98	125
Derivative liabilities, net	(52)	(43)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	259	154
Gross Amounts Offset in the Consolidated Statements of Financial Position	(244)	(135)
Derivative assets, net	15	19
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(250)	(137)
Gross Amounts Offset in the Consolidated Statements of Financial Position	238	129
Derivative liabilities, net	(12)	(8)
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	0	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative assets, net	0	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(6)	(5)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Derivative liabilities, net	$ (6)	$ (5)

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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