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Employee Benefit Plans - Plan Assets by Category (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets $ 703 $ 622 $ 444
Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 683    
Trust Receivables And Payables      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 20    
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 141    
Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   496  
Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 220    
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   126  
Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 322    
Global Equity Commingled Funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   183  
Global Equity Commingled Funds | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 91    
Global Equity Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Global Equity Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 52    
Global Equity Commingled Funds | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   183  
Global Equity Commingled Funds | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 39    
Global Equity Commingled Funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Global Equity Commingled Funds | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Global Equity Commingled Funds | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Global Equity Commingled Funds | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Global Equity Funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   78  
Global Equity Funds | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 154    
Global Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Global Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Global Equity Funds | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Global Equity Funds | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Global Equity Funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Global Equity Funds | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Global Equity Funds | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   78  
Global Equity Funds | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 154    
Governments      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   54  
Governments | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 61    
Governments | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Governments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 20    
Governments | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   54  
Governments | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 41    
Governments | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Governments | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Governments | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Governments | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Corporate Bonds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   87  
Corporate Bonds | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 53    
Corporate Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Corporate Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 49    
Corporate Bonds | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   87  
Corporate Bonds | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 4    
Corporate Bonds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Corporate Bonds | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Corporate Bonds | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Corporate Bonds | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Fixed Income Securities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   47  
Fixed Income Securities | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 90    
Fixed Income Securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Fixed Income Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Fixed Income Securities | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Fixed Income Securities | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Fixed Income Securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Fixed Income Securities | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Fixed Income Securities | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   47  
Fixed Income Securities | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 90    
Real estate      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   27  
Real estate | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 30    
Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 12    
Real estate | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   26  
Real estate | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 6    
Real estate | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Real estate | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Real estate | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   1  
Real estate | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 12    
Other      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   138  
Other | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 156    
Other | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Other | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 2    
Other | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   138  
Other | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 129    
Other | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Other | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Other | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Other | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 25    
Cash and cash equivalents      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   8  
Cash and cash equivalents | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 48    
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 6    
Cash and cash equivalents | Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   8  
Cash and cash equivalents | Significant Observable Inputs (Level 2) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 1    
Cash and cash equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   0  
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets 0    
Cash and cash equivalents | Not Subject to Leveling      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets   $ 0  
Cash and cash equivalents | Not Subject to Leveling | Plan Assets At Fair Value      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value of plan assets $ 41