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Stock Incentive Plans - Schedule of Options (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Additional Disclosures          
Total intrinsic value of options exercised $ 1 $ 25 $ 7 $ 35  
Stock Options          
Number of Option Shares          
Outstanding beginning of period (in shares)     2,318,768    
Granted (in shares)     0    
Exercised (in shares)     (301,909)    
Canceled/Forfeited (in shares)     (618)    
Expired (in shares)     (91,442)    
Outstanding end of period (in shares) 1,924,799   1,924,799   2,318,768
Weighted Average Exercise Price          
Weighted average exercise price - beginning of period (in dollars per share)     $ 30.40    
Weighted average exercise price - granted (in dollars per share)     0    
Weighted average exercise price - exercised (in dollars per share)     32.20    
Weighted average exercise price - cancelled/forfeited (in dollars per share)     48.60    
Weighted average exercise price - expired (in dollars per share)     33.37    
Weighted average exercise price - end of period (in dollars per share) $ 29.97   $ 29.97   $ 30.40
Additional Disclosures          
Weighted average remaining contractual life (in years)     4 years 10 months 24 days   4 years 9 months 18 days
Aggregate intrinsic value $ 8   $ 8   $ 79
Total intrinsic value of options exercised     $ 7    
Vested and Expected to Vest          
Vested and expected to vest in the future as of period end (in shares) 1,924,648   1,924,648    
Exercisable as of period end (in shares) 1,922,449   1,922,449    
Weighted average exercise price vested and expected to vest as of period end (in dollars per share) $ 29.97   $ 29.97    
Weighted average exercise price exercisable as of period end (in dollars per share) $ 29.94   $ 29.94    
Weighted average remaining contractual life vested and expected to vest in the future as of period end (in years)     4 years 10 months 24 days    
Weighted average remaining contractual life exercisable as of period end (in years)     4 years 10 months 24 days    
Aggregate intrinsic value vested and expected to vest in the future as of period end $ 8   $ 8    
Aggregate intrinsic value exercisable as of period end $ 8   $ 8