Debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

	June 30, 2020		December 31, 2019
6.150% Notes, due 2020	—		1,000
5.400% Notes due 2021	361		1,250
5.870% Notes, due 2022	476		627
5.125% Notes, due 2024	1,250		1,250
6.875% Notes, due 2025	1,200		—
5.900% Notes, due 2027	625		625
6.750% Bonds, due 2028	300		300
5.950% Notes, due 2037	625		625
4.750% Iowa Finance Authority Loan, due 2042	250		250
Other (1)	(1)		13
	5,086		5,940
Less: amount due within one year	391		1,034
Total long-term debt	$	4,695	$	4,906

(1)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