Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative Assets
Derivative Assets	$ 703	$ 775
Derivative assets, current	105	133
Derivative assets, noncurrent	43	41
Derivative Liabilities
Derivative Liabilities	(640)	(770)
Derivative liabilities, current	(52)	(83)
Derivative liabilities, noncurrent	(33)	(86)
Current derivative assets
Derivative Assets
Derivative Assets	531	646
Counterparty netting	(426)	(513)
Derivative assets, current	105	133
Noncurrent derivative assets
Derivative Assets
Derivative Assets	172	129
Counterparty netting	(129)	(88)
Derivative assets, noncurrent	43	41
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(478)	(596)
Counterparty netting	426	513
Derivative liabilities, current	(52)	(83)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(162)	(174)
Counterparty netting	129	88
Derivative liabilities, noncurrent	$ (33)	$ (86)

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.

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