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Fair Value Measurements (Details 2) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets and liabilities measured at fair value on a recurring basis
Payment to CHS related to credit provision	$ (5)	$ (5)	$ (5)	$ (5)	$ (5)	$ (5)	$ (5)	$ (5)
Loss on embedded derivative						1	3	$ 4
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,507	575				1,507	575
Nonqualified employee benefit trusts	20	19				20	19
Derivative assets	16	1				16	1
Derivative liabilities	(47)	(7)				(47)	(7)
Embedded Derivative, Fair Value of Embedded Derivative Liability	(15)	(18)				(15)	(18)
Recurring basis | Quoted Prices in Active Markets (Level 1)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	1,507	575				1,507	575
Nonqualified employee benefit trusts	20	19				20	19
Derivative assets	0	0				0	0
Derivative liabilities	0	0				0	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	0	0				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				0	0
Nonqualified employee benefit trusts	0	0				0	0
Derivative assets	16	1				16	1
Derivative liabilities	(47)	(7)				(47)	(7)
Embedded Derivative, Fair Value of Embedded Derivative Liability	(15)	(18)				(15)	(18)
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	0	0				0	0
Nonqualified employee benefit trusts	0	0				0	0
Derivative assets	0	0				0	0
Derivative liabilities	0	0				0	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	0	0				0	0
Estimate of Fair Value Measurement
Debt Instrument, Fair Value Disclosure [Abstract]
Long-term debt, Fair Value	4,113	4,731				4,113	4,731
Reported Value Measurement
Debt Instrument, Fair Value Disclosure [Abstract]
Long-term debt, Fair Value	$ 3,465	$ 3,961				$ 3,465	$ 3,961

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