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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other income tax disclosures      
Effect of unrecognized tax benefit on income tax expense $ 43 $ 39 $ 39
Interest expense and penalties related to unrecognized income tax expense 2 3  
Net accrued interest and penalties 23 $ 21  
State      
Operating loss carryforwards      
State NOL carryforwards 3,088    
Deferred income tax asset for State NOL carryforwards 166    
Federal      
Operating loss carryforwards      
Federal NOL carryforwards 80    
Deferred income tax asset for Federal NOL carryforwards $ 17    
Maximum      
Other income tax disclosures      
Interest expense and penalties related to unrecognized income tax expense     $ 1