Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral netted against Derivative assets	$ 0	$ (17)
Cash collateral netted against Derivative liabilities	4	0
Cash collateral recorded in Accounts receivable	12	10
Cash collateral recorded in Accounts payable	(3)	(6)
Total net cash collateral posted (received)	$ 13	$ (13)

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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