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