Debt - Schedule of Carrying Values and Fair Values of Debt Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 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	51	53
Secured debt | Credit Agreement | Line of credit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	2,244	2,250
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	4,243	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	273	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	51	53
Reported Value Measurement | Secured debt | Credit Agreement | Line of credit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	2,233	2,239
Estimate of Fair Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	4,120	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	930	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	461	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	283	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	207	222
Estimate of Fair Value Measurement | Other
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, gross	51	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	$ 2,188	$ 2,243