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Employee Benefit Plans - Defined Benefit Plan and Other Postretirement Benefit Plans Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit gain $ 8 $ 10 $ 12
Other comprehensive income (loss), before tax 4 18 (17)
Plan assets 280 260  
Defined Pension  Benefits      
Defined Benefit Plan Disclosure [Line Items]      
AOCI not yet recognized (40) (41)  
Plan assets 274 254 218
Expected benefits to be paid in the next ten years 110    
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
AOCI not yet recognized 6 4  
Plan assets 6 $ 6 $ 6
Expected benefits to be paid in the next ten years $ 14