Derivative Instruments and Hedging Activities (Assets and Liabilities - Current vs. Noncurrent Derivative instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	$ 75	$ 84
Derivative Liability, Current	51	211
Derivative Asset, Noncurrent	187	264
Derivative Liability, Noncurrent	206	104
Total asset derivatives	262	348
Total liability derivatives	$ 257	315
Contracts Subject To Netting Arrangements
Derivatives, Fair Value [Line Items]
Total liability derivatives		15
Collateral Already Posted, Aggregate Fair Value		$ 9

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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