Income Taxes - Summary of Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2021 USD ($)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 10,210
Deferred income taxes on net operating loss carryforwards	776
Tax credits	44
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	297
Deferred income taxes on net operating loss carryforwards	63
Tax credits	15
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	9,013
Deferred income taxes on net operating loss carryforwards	506
Tax credits	29
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	900
Deferred income taxes on net operating loss carryforwards	207
Tax credits	$ 0

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

+ References

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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