Long-Term Debt and Credit Facilities - Schedule of Debt Repayments (Details) - Senior Notes - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023
Long-term Debt and Credit Facilities
Repayments of debt			$ 1,554
5.625% Senior Notes, Series X, due 2025
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	5.625%		5.625%
Repayments of debt	$ 1	$ 48
7.200% Senior Notes, Series D, due 2025
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	7.20%		7.20%
Repayments of debt		21
5.125% Senior Notes due 2026
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	5.125%		5.125%
Repayments of debt		291
6.875% Debentures, Series G, due 2028
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	6.875%		6.875%
Repayments of debt		52
5.375% Senior Notes due 2029
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	5.375%		5.375%
Repayments of debt		275
4.500% Senior Notes due 2029
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	4.50%		4.50%
Repayments of debt	$ 2	556
7.600% Senior Notes, Series P, due 2039
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	7.60%		7.60%
Repayments of debt	$ 3	161
7.650% Senior Notes, Series U, due 2042
Long-term Debt and Credit Facilities
Stated interest rate (as a percent )	7.65%		7.65%
Repayments of debt	$ 13	$ 131