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Pension Benefits - Narrative (Details) - Pension Plan
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
participant
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]                
Net periodic pension expense   $ 16     $ 5 $ 151 $ 19  
Cash contributions to the plans   $ 120     $ 6 $ 132 $ 53  
Percentage threshold of greater of projected benefit obligation or market value of assets (percent)   10.00%       10.00%    
United States                
Defined Benefit Plan Disclosure [Line Items]                
Cash contributions to the plans   $ 114            
Number of participants elected to receive settlement | participant 1,300              
Lump sum payments under settlement $ 49              
Pre-tax settlement expense     $ 105 $ 17   $ 122    
After-tax settlement expense     78 $ 12   $ 90    
Annuity contracts purchased     $ 280          
Accumulated comprehensive loss               $ 121