Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral netted against Derivative assets	$ (12)	$ 0
Cash collateral netted against Derivative liabilities	6	0
Cash collateral recorded in Accounts receivable	14	13
Cash collateral recorded in Accounts payable	(1)	(3)
Total net cash collateral posted (received)	$ 7	$ 10

Cash Collateral Posted (Received), Net

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

+ References

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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