Debt - Schedule of Carrying Values and Fair Values of Debt Outstanding (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
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	276	276
8.375% Debentures due 2027 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	200	200
Other
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	49	53
Secured Debt | Credit Agreement | Line of Credit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	2,239	2,250
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	4,237	4,250
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	992	991
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	495	495
Reported Value Measurement | 7.950% Debentures due 2025 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	274	273
Reported Value Measurement | 8.375% Debentures due 2027 | Unsecured Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	199	199
Reported Value Measurement | Other
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	49	53
Reported Value Measurement | Secured Debt | Credit Agreement | Line of Credit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	2,228	2,239
Estimate of Fair Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	3,861	4,295
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	856	975
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	426	497
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	243	305
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	176	222
Estimate of Fair Value Measurement | Other
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	49	53
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	$ 2,111	$ 2,243