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Employee Benefit Plans - Allocation of Plan Assets (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value $ 583 $ 654
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 336 315
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 9 10
Cash and cash equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 24 17
Cash and cash equivalents | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 0 0
Cash and cash equivalents | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 0 0
Equity securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 20 134
Equity securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 175 123
Equity securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 0 0
Fixed income securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 213 188
Fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 165 214
Fixed income securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 0 0
Other investments | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 326 315
Other investments | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value (4) (22)
Other investments | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value $ 9 $ 10