Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral netted against Derivative assets	$ 0	$ (12)
Cash collateral netted against Derivative liabilities	0	6
Cash collateral recorded in Accounts receivable	23	14
Cash collateral recorded in Accounts payable	(1)	(1)
Total net cash collateral posted (received)	$ 22	$ 7

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