Derivative Financial Instruments (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets:
Net Fair Value Presented in the Consolidated Balance Sheet, current	$ 32	$ 52
Derivative Liability [Abstract]
Net Fair Value Presented in the Consolidated Balance Sheet, current	12	27
Net Fair Value Presented in the Consolidated Balance Sheet, noncurrent	8	0
Contingent consideration	91
Significant Other Observable Inputs (Level 2)
Derivative Liability [Abstract]
Contingent consideration	91
Derivatives - current \| Derivatives not designated as hedging instruments \| Commodity price derivatives
Assets:
Fair Value	32	59
Gross Amounts Offset in the Consolidated Balance Sheet	0	(7)
Net Fair Value Presented in the Consolidated Balance Sheet, current	32	52
Derivative Liability [Abstract]
Fair Value	12	34
Gross Amounts Offset in the Consolidated Balance Sheet	0	(7)
Net Fair Value Presented in the Consolidated Balance Sheet, current	12	$ 27
Other assets - noncurrent \| Derivatives not designated as hedging instruments \| Commodity price derivatives
Assets:
Fair Value	91
Net Fair Value Presented in the Consolidated Balance Sheet, current	91
Other assets - noncurrent \| Derivatives not designated as hedging instruments \| Contingent consideration
Assets:
Gross Amounts Offset in the Consolidated Balance Sheet	0
Derivatives - noncurrent \| Derivatives not designated as hedging instruments \| Commodity price derivatives
Derivative Liability [Abstract]
Fair Value	8
Gross Amounts Offset in the Consolidated Balance Sheet	0
Net Fair Value Presented in the Consolidated Balance Sheet, noncurrent	$ 8

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