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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other income tax disclosures      
Effect of unrecognized tax benefit on income tax expense $ 28 $ 41 $ 37
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense (10) 2 $ 3
Net accrued interest and penalties 12 $ 23  
State      
Other income tax disclosures      
State NOL carryforwards 2,058    
Deferred income tax asset for State NOL carryforwards 90    
Federal      
Other income tax disclosures      
Federal NOL carryforward 170    
Deferred tax asset for Federal NOL carryforward $ 36