Income Taxes - Additional Information (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Income Tax Examination [Line Items]
Gross deferred tax asset related to net operating loss carryforwards	$ 4,323,000,000	$ 5,037,000,000
Gross deferred tax asset related to foreign net operating loss carryforwards	300,000,000
Gross deferred tax asset related to net U.S. federal operating loss carryforwards	3,507,000,000
Gross deferred tax asset related to net operating loss carryforwards for various U.S. states	516,000,000
Deferred tax asset related to foreign net operating loss carryforwards, net of valuation allowance	166,000,000
Valuation allowance against net deferred tax assets	3,838,000,000	5,391,000,000
Alternative minimum tax credit carryforwards	18,000,000
Other business credit carryforwards	71,000,000
Foreign tax credit carryforwards - Before valuation allowance	1,000,000
Unrecognized tax benefits that would impact effective income tax rate	15,000,000
Accrued interest and penalties	6,000,000	$ 6,000,000
Minimum
Income Tax Examination [Line Items]
Unrecognized tax benefits decrease reasonably possible	0
Maximum
Income Tax Examination [Line Items]
Unrecognized tax benefits decrease reasonably possible	15,000,000
U.S. Federal | Midstream
Income Tax Examination [Line Items]
Valuation allowance against net deferred tax assets	12,000,000
U.S. State | Midstream
Income Tax Examination [Line Items]
Valuation allowance against net deferred tax assets	$ 3,000,000