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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit gain $ 10 $ 12 $ 8
Other comprehensive income (loss), before tax 18 (17) 15
Plan assets 260 224  
Defined Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
AOCI not yet recognized (41) (64)  
Plan assets 254 218 246
Expected benefits to be paid in the next ten years 100    
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
AOCI not yet recognized 4 9  
Plan assets 6 $ 6 $ 6
Expected benefits to be paid in the next ten years $ 18