Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Jan. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Other	$ (16)			$ (19)
Total long-term debt	$ 3,989			4,162
5.125% Notes, due 2024
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.125%	5.125%	5.125%
Amount outstanding	$ 905			1,081
6.875% Notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	6.875%
Amount outstanding	$ 600			600
5.900% Notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.90%
Amount outstanding	$ 625			625
6.750% Bonds, due 2028
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	6.75%
Amount outstanding	$ 300			300
3.000% Notes, due 2029
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	3.00%
Amount outstanding	$ 700			700
5.950% Notes, due 2037
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.95%
Amount outstanding	$ 625			625
4.750% Iowa Finance Authority Loan, due 2042
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.75%
Amount outstanding	$ 250			$ 250