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Pension Benefits - Narrative (Details)
12 Months Ended
Dec. 31, 1996
Mar. 31, 2016
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Expected amortization of actuarial loss   $ 15,000,000    
Prior service credit   1,000,000    
Actuarial loss   47,000,000    
Expected benefit payments in 2017   59,000,000    
Expected benefit payments in 2018   174,000,000    
Expected benefit payments in 2019   110,000,000    
Expected benefit payments in 2020   66,000,000    
Expected benefit payments in 2021   65,000,000    
Expected benefit payments in 2022 through 2026   327,000,000    
Expected contributions in next fiscal year   $ 15,000,000    
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of eligible compensation (up to)   75.00%    
Contribution expenses   $ 99,000,000 $ 103,000,000 $ 83,000,000
U.S. Plans | 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%    
U.S. Plans | 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%    
Pensjonsordningen for Apoteketaten (POA)        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of total plan contribution (exceeding)   5.00%    
Amounts of plan exceeding total plan contribution   $ 23,000,000 24,000,000 5,000,000
Funded status (as a percent)   66.00%    
Amounts accrued for liability   $ 0    
U.S. Plans        
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%    
Prior service credit   $ 0 8,000,000 0
Actuarial loss   44,000,000 27,000,000 32,000,000
Projected benefit obligation   $ 535,000,000 $ 583,000,000 540,000,000
Discount rates   3.27% 3.18%  
Increase in basis points   0.0009    
U.S. Plans | Equity Investments        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations (as a percent)   50.00% 50.00%  
U.S. Plans | Fixed Income Investments        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations (as a percent)   45.00% 45.00%  
U.S. Plans | Real Estate        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations (as a percent)   5.00% 5.00%  
U.S. Plans | Unfunded plan        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation   $ 175,000,000 $ 189,000,000  
Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Unit value of cash and cash equivalents (in dollars per share) | $ / shares   $ 1.00    
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of obligation   1.00%    
Remediation period if shortfall exceeds threshold amount   2 years    
Prior service credit   $ 2,000,000 2,000,000 2,000,000
Actuarial loss   5,000,000 5,000,000 4,000,000
Projected benefit obligation   $ 899,000,000 $ 963,000,000 $ 934,000,000
Discount rates   2.84% 2.50%  
Increase in basis points   0.0034    
Amount of plan asset value   $ 40,000,000 $ 39,000,000  
Non-U.S. Plans | Unfunded plan        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation   $ 272,000,000 $ 222,000,000