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Stockholders' Equity 2 (Details) - Current Stock Repurchase Program - USD ($)
shares in Millions, $ in Millions
6 Months Ended
Sep. 30, 2017
Nov. 13, 2015
Stock Repurchase Program [Line Items]    
Stock repurchase program, Authorized amount   $ 750
Shares of common stock repurchased 2.8  
Value of common stock repurchased $ 90  
Stock repurchase program, Remaining authorized common stock repurchase amount $ 560