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Pension Benefits - Narrative (Details) - Pension Plan
$ in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2019
USD ($)
participant
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Net periodic pension expense   $ 24 $ 5  
Cash contributions to the plans   $ 6 $ 3  
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]        
Number of participants elected to receive settlement | participant 1,300      
Lump sum payments under settlement $ 49      
Pre-tax settlement expense   $ 17    
Accumulated comprehensive loss $ 95 $ 95   $ 121