Fair Value of Financial Instruments - Schedule of Estimated Fair Value of Financial Instruments, by Balance Sheet Grouping (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets:
Available-for-sale debt securities	$ 178	$ 110
Carrying Amount
Assets:
Cash and cash equivalents	507	1,676
Investments in equity securities	144	129
Available-for-sale debt securities	178	110
Trading securities	13	12
Carrying Amount | Senior Secured Notes | Senior Secured Notes at 6.25%, Due 2023
Liabilities:
Notes payable, fair value disclosure		95
Carrying Amount | Senior Secured Notes | Senior Secured Notes at 8.625%, Due 2024
Liabilities:
Notes payable, fair value disclosure		1,025
Carrying Amount | Senior Secured Notes | Senior Secured Notes at 6.625% Due 2025
Liabilities:
Notes payable, fair value disclosure	1,434	1,427
Carrying Amount | Senior Secured Notes | Senior Secured Notes at 8%, Due 2026
Liabilities:
Notes payable, fair value disclosure	2,078	2,074
Carrying Amount | Senior Secured Notes | Senior Secured Notes at 8% Due 2027
Liabilities:
Notes payable, fair value disclosure	692	692
Carrying Amount | Senior Secured Notes | Senior Secured Notes at 5.625% due 2027
Liabilities:
Notes payable, fair value disclosure	1,819	1,809
Carrying Amount | Senior Secured Notes | Senior Notes at 6% Due 2029
Liabilities:
Notes payable, fair value disclosure	860	857
Carrying Amount | Senior Secured Notes | Senior Secured Notes at 4.750% due 2031
Liabilities:
Notes payable, fair value disclosure	1,090
Carrying Amount | Senior Notes | Senior Notes at 6.875%, Due 2022
Liabilities:
Notes payable, fair value disclosure		125
Carrying Amount | Senior Notes | Senior Notes at 6.875% Due 2028
Liabilities:
Notes payable, fair value disclosure	759	758
Carrying Amount | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 9.875% Due 2023
Liabilities:
Notes payable, fair value disclosure		1,756
Carrying Amount | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 8.125% Due 2024
Liabilities:
Notes payable, fair value disclosure		1,336
Carrying Amount | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 6.875% Due 2029
Liabilities:
Notes payable, fair value disclosure	1,625
Carrying Amount | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 6.125% Due 2030
Liabilities:
Notes payable, fair value disclosure	1,352
Carrying Amount | ABL Facility and Other Debt
Liabilities:
Notes payable, fair value disclosure	32	23
Estimated Fair Value
Assets:
Cash and cash equivalents	507	1,676
Investments in equity securities	144	129
Available-for-sale debt securities	178	110
Trading securities	13	12
Estimated Fair Value | Senior Secured Notes | Senior Secured Notes at 6.25%, Due 2023
Liabilities:
Notes payable, fair value disclosure		99
Estimated Fair Value | Senior Secured Notes | Senior Secured Notes at 8.625%, Due 2024
Liabilities:
Notes payable, fair value disclosure		1,080
Estimated Fair Value | Senior Secured Notes | Senior Secured Notes at 6.625% Due 2025
Liabilities:
Notes payable, fair value disclosure	1,517	1,543
Estimated Fair Value | Senior Secured Notes | Senior Secured Notes at 8%, Due 2026
Liabilities:
Notes payable, fair value disclosure	2,210	2,275
Estimated Fair Value | Senior Secured Notes | Senior Secured Notes at 8% Due 2027
Liabilities:
Notes payable, fair value disclosure	758	760
Estimated Fair Value | Senior Secured Notes | Senior Notes at 6% Due 2029
Liabilities:
Notes payable, fair value disclosure	966	973
Estimated Fair Value | Senior Secured Notes | Senior Secured Notes at 4.750% due 2031
Liabilities:
Notes payable, fair value disclosure	1,108
Estimated Fair Value | Senior Notes | Senior Notes at 6.875%, Due 2022
Liabilities:
Notes payable, fair value disclosure		125
Estimated Fair Value | Senior Notes | Senior Secured Notes at 5.625% due 2027
Liabilities:
Notes payable, fair value disclosure	2,011	2,048
Estimated Fair Value | Senior Notes | Senior Notes at 6.875% Due 2028
Liabilities:
Notes payable, fair value disclosure	758	618
Estimated Fair Value | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 9.875% Due 2023
Liabilities:
Notes payable, fair value disclosure		1,861
Estimated Fair Value | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 8.125% Due 2024
Liabilities:
Notes payable, fair value disclosure		1,408
Estimated Fair Value | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 6.875% Due 2029
Liabilities:
Notes payable, fair value disclosure	1,823
Estimated Fair Value | Junior-Priority Secured Notes | Junior-Priority Secured Notes at 6.125% Due 2030
Liabilities:
Notes payable, fair value disclosure	1,431
Estimated Fair Value | ABL Facility and Other Debt
Liabilities:
Notes payable, fair value disclosure	$ 32	$ 23