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Pension Benefits - Narrative (Details)
12 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Percentage of eligible compensation (up to) 75.00%    
Contribution expenses $ 92,000,000 $ 82,000,000 $ 98,000,000
First Part Of Pay Contribution      
Defined Benefit Plan Disclosure [Line Items]      
Company match employee contributions (as a percent) 100.00%    
Employee contributions (as a percent) 3.00%    
Second Part Of Pay Contribution      
Defined Benefit Plan Disclosure [Line Items]      
Company match employee contributions (as a percent) 50.00%    
Employee contributions (as a percent) 2.00%    
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Highest average pay period 60 months    
Plan years prior to freeze date 15 years    
Unexpected actuarial losses (as a percent) (exceeding) 10.00%    
Expected amortization of actuarial loss $ 11,000,000    
Amortization of actuarial loss from stockholders' equity 14,000,000    
Expected benefit payments in 2020 180,000,000    
Expected benefit payments in 2021 64,000,000    
Expected benefit payments in 2022 64,000,000    
Expected benefit payments in 2023 62,000,000    
Expected benefit payments in 2024 62,000,000    
Expected benefit payments in 2025 through 2029 327,000,000    
Expected contributions in next fiscal year $ 146,000,000    
Unit value of cash and cash equivalents (in dollars per share) | $ / shares $ 1.00    
United States | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated pension obligation $ 121,000,000 120,000,000  
Actuarial loss 9,000,000 8,000,000 11,000,000
Prior service credit 0 0 0
Projected benefit obligation $ 439,000,000 $ 485,000,000 513,000,000
Discount rates 3.65% 3.69%  
Increase (decrease) in basis points (0.0004)    
United States | Pension Plans, Defined Benefit | Equity Investments      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent)   26.00%  
United States | Pension Plans, Defined Benefit | Fixed Income Investments      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 100.00% 70.00%  
United States | Pension Plans, Defined Benefit | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent)   4.00%  
United States | Pension Plans, Defined Benefit | Unfunded plan      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation $ 124,000,000 $ 160,000,000  
Non-U.S. Plans | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss 5,000,000 6,000,000 4,000,000
Prior service credit 0 0 2,000,000
Projected benefit obligation $ 990,000,000 $ 1,035,000,000 943,000,000
Discount rates 2.13% 2.35%  
Increase (decrease) in basis points (0.0022)    
Percentage of total plan contribution - exceeding 5.00%    
Amounts of plan exceeding total plan contribution $ 27,000,000 $ 16,000,000 $ 18,000,000
Funded status (as a percent) 75.00%    
Amounts accrued for liability $ 0    
Non-U.S. Plans | Pension Plans, Defined Benefit | Norwegian Public Service Pension Fund (SPK)      
Defined Benefit Plan Disclosure [Line Items]      
Amount of plan asset value 35,000,000 38,000,000  
Non-U.S. Plans | Pension Plans, Defined Benefit | Unfunded plan      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 293,000,000 $ 297,000,000  
Termination of U.S Defined Benefit Pension Plan and Settlement of Retirement Benefits | United States | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Expected amortization of actuarial loss 132,000,000    
Termination of U.S Defined Benefit Pension Plan | United States | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Expected amortization of actuarial loss 121,000,000    
Settlement of Executive Retirement Benefits | Retired executive | United States | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Expected amortization of actuarial loss $ 11,000,000