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Pension Benefits - Narrative (Details)
12 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Percentage of eligible compensation (up to) 75.00%    
Contribution expenses $ 82,000,000 $ 98,000,000 $ 99,000,000
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    
Percentage of obligation 1.00%    
Remediation period if shortfall exceeds threshold amount 2 years    
Unexpected actuarial losses (as a percent) (exceeding) 10.00%    
Expected amortization of actuarial loss $ (9,000,000) (14,000,000)  
Expected benefit payments in 2019 97,000,000    
Expected benefit payments in 2020 184,000,000    
Expected benefit payments in 2021 65,000,000    
Expected benefit payments in 2022 70,000,000    
Expected benefit payments in 2023 67,000,000    
Expected benefit payments in 2024 through 2028 339,000,000    
Expected contributions in next fiscal year $ 55,000,000    
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]      
Prior service credit $ 0 0 0
Actuarial loss 8,000,000 11,000,000 44,000,000
Projected benefit obligation $ 485,000,000 $ 513,000,000 535,000,000
Discount rates 3.69% 3.39%  
Increase (decrease) in basis points 0.0030    
United States | Pension Plans, Defined Benefit | Equity Investments      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 26.00% 50.00%  
United States | Pension Plans, Defined Benefit | Fixed Income Investments      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 70.00% 45.00%  
United States | Pension Plans, Defined Benefit | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Target plan asset allocations (as a percent) 4.00% 5.00%  
United States | Unfunded plan | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation $ 160,000,000 $ 176,000,000  
Non-U.S. Plans | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Prior service credit 0 2,000,000 2,000,000
Actuarial loss 6,000,000 4,000,000 5,000,000
Projected benefit obligation $ 1,035,000,000 $ 943,000,000 899,000,000
Discount rates 2.35% 2.35%  
Increase (decrease) in basis points 0    
Percentage of total plan contribution (exceeding) 5.00%    
Amounts of plan exceeding total plan contribution $ 16,000,000 $ 18,000,000 $ 23,000,000
Funded status (as a percent) 75.00%    
Amounts accrued for liability $ 0    
Non-U.S. Plans | Unfunded plan | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 297,000,000 276,000,000  
Norwegian Public Service Pension Fund (SPK) | Non-U.S. Plans | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Amount of plan asset value $ 38,000,000 $ 37,000,000