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Employee Benefit Plans - Allocation of Plan Assets (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value $ 803 $ 583
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 205 336
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 0 9
Cash and cash equivalents (1) | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 230 24
Cash and cash equivalents (1) | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 0 0
Cash and cash equivalents (1) | 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 10 20
Equity securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 93 175
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 202 213
Fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 105 165
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 361 326
Other investments | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value 7 (4)
Other investments | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total investments at fair value $ 0 $ 9