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Fair Value Measurements (Details 2) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2021	Sep. 30, 2020
Assets and liabilities measured at fair value on a recurring basis
Payments for Strategic Venture Compliance	$ 5	$ 5	$ 5	$ 5	$ 5	$ 5
Unrealized Loss on Embedded Derivative Instrument						2	$ 2
Estimate of Fair Value Measurement
Assets and liabilities measured at fair value on a recurring basis
Fair value of long-term debt, including current portion	4,731					4,165
Reported Value Measurement
Assets and liabilities measured at fair value on a recurring basis
Fair value of long-term debt, including current portion	3,961					3,465
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	575					705
Nonqualified employee benefit trusts	19					20
Derivative Liability	7					3
Embedded derivative liability	(18)					(20)
Derivative Asset	1					15
Recurring basis | Quoted Prices in Active Markets (Level 1)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	575					705
Nonqualified employee benefit trusts	19					20
Derivative Liability	0					0
Embedded derivative liability	0					0
Derivative Asset	0					0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	0					0
Nonqualified employee benefit trusts	0					0
Derivative Liability	7					3
Embedded derivative liability	(18)					(20)
Derivative Asset	1					15
Recurring basis | Fair Value, Inputs (Level 3)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	0					0
Nonqualified employee benefit trusts	0					0
Derivative Liability	0					0
Embedded derivative liability	0					0
Derivative Asset	$ 0					$ 0

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