Derivative Financial Instruments (Schedule of Derivative Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets:
Net Fair Value Presented in the Consolidated Balance Sheet	$ 49	$ 32
Liabilities:
Net Fair Value Presented in the Consolidated Balance Sheet	51	12
Derivatives	14	8
Derivatives not designated as hedging instruments \| Commodity price derivatives \| Derivatives - current
Assets:
Fair Value	49	32
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Fair Value Presented in the Consolidated Balance Sheet	49	32
Liabilities:
Fair Value	51	12
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Fair Value Presented in the Consolidated Balance Sheet	51	12
Derivatives not designated as hedging instruments \| Commodity price derivatives \| Derivatives - noncurrent
Liabilities:
Fair Value	14	8
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Derivatives	$ 14	8
Derivatives not designated as hedging instruments \| Commodity price derivatives \| Other assets - noncurrent
Assets:
Fair Value		91
Net Fair Value Presented in the Consolidated Balance Sheet		91
Derivatives not designated as hedging instruments \| Contingent consideration \| Other assets - noncurrent
Assets:
Gross Amounts Offset in the Consolidated Balance Sheet		$ 0

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