Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral netted against Derivative assets	$ (122)	$ (12)
Cash collateral netted against Derivative liabilities	58	6
Cash collateral recorded in Accounts receivable	66	14
Cash collateral recorded in Accounts payable	(8)	(1)
Total net cash collateral posted (received)	$ (6)	$ 7

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