Debt - Schedule of Carrying Values and Fair Values of Debt Outstanding (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
4.000% Senior Secured Notes due 2027 | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	$ 1,000	$ 1,000
4.375% Senior Secured Notes due 2028 | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	500	500
7.950% Debentures due 2025 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	217	217
8.375% Debentures due 2027 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	167	167
Other
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	45	49
Secured Debt | Credit Agreement | Line of Credit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	1,933	2,227
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	3,840	4,136
Reported Value Measurement | 4.000% Senior Secured Notes due 2027 | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	994	993
Reported Value Measurement | 4.375% Senior Secured Notes due 2028 | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	496	496
Reported Value Measurement | 7.950% Debentures due 2025 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	216	215
Reported Value Measurement | 8.375% Debentures due 2027 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	166	166
Reported Value Measurement | Other
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	45	49
Reported Value Measurement | Secured Debt | Credit Agreement | Line of Credit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	1,923	2,217
Estimate of Fair Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	3,698	3,964
Estimate of Fair Value Measurement | 4.000% Senior Secured Notes due 2027 | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	894	890
Estimate of Fair Value Measurement | 4.375% Senior Secured Notes due 2028 | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	438	447
Estimate of Fair Value Measurement | 7.950% Debentures due 2025 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	220	210
Estimate of Fair Value Measurement | 8.375% Debentures due 2027 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	170	162
Estimate of Fair Value Measurement | Other
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	45	49
Estimate of Fair Value Measurement | Secured Debt | Credit Agreement | Line of Credit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	$ 1,931	$ 2,206