Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Debt.

December 31,	2021		2020
5.400% Notes, due 2021(1)	$	—	$	361
5.870% Notes, due 2022(2)	—		476
5.125% Notes, due 2024	1,150		1,250
6.875% Notes, due 2025	600		1,200
5.900% Notes, due 2027	625		625
6.750% Bonds, due 2028	300		300
3.000% Notes due 2029	700		—
5.950% Notes, due 2037	625		625
4.750% Iowa Finance Authority Loan, due 2042	250		250
Other(3)	(18)		(12)
	4,232		5,075
Less: amount due within one year	5		376
Total long-term debt	$	4,227	$	4,699

(1)Redeemed on January 15, 2021.

(2)Redeemed on May 3, 2021.

(3)Includes various financing arrangements related to subsidiaries, unamortized debt discounts and unamortized debt issuance costs related to outstanding notes and bonds listed in the table above.