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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 22 $ 13 $ 52 $ 48
Total share-based compensation expense 29 13 74 48
Tax impact [1] (10) (5) (26) (17)
Reduction in net income 19 8 48 31
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 13 6 29 26
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 9 7 23 21
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 0 0 0 1
Equity Awards        
Share-Based Compensation Expense [Line Items]        
Immediately vested RSU's issued under annual bonus program and impact of accelerated vesting on equity awards [2] 0 0 2 0
Annual Bonus Plan | Restricted Share Units (RSUs)        
Share-Based Compensation Expense [Line Items]        
Immediately vested RSU's issued under annual bonus program and impact of accelerated vesting on equity awards [3] $ 7 $ 0 $ 20 $ 0
[1] Represents the income tax benefit recognized in the statements of operations for share-based compensation arrangements.
[2] Represents the impact of the acceleration of certain vesting schedules for equity awards pursuant to certain severance arrangements.
[3] Represents the impact of immediately vested stock awards granted as part of our annual bonus program, and issued in lieu of cash bonuses.