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Redeemable Noncontrolling Interests and Noncontrolling Interests - Schedule of Changes in Noncontrolling Interests and Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Beginning balance $ 178    
Net income attributable to noncontrolling interests 230 $ 83 $ 52
Other comprehensive income (loss) 185 (79)  
Payments to noncontrolling interests (98)    
Ending balance 253 178  
Redeemable Noncontrolling Interest, Beginning balance 1,327    
Other comprehensive income (loss) 185 (79)  
Payments to noncontrolling interests (98)    
Redeemable Noncontrolling Interest, Ending balance 1,459 1,327  
Noncontrolling interests      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Beginning balance 178 84  
Net income attributable to noncontrolling interests 187 39  
Other comprehensive income (loss) 0 0  
Payments to noncontrolling interests (98)    
Exercises of Put Right 0    
Other (14) (34)  
Ending balance 253 178 84
Other comprehensive income (loss) 0 0  
Purchases of noncontrolling interests   89  
Payments to noncontrolling interests (98)    
Other (14) (34)  
Redeemable Noncontrolling Interest      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Other comprehensive income (loss) 185 (78)  
Payments to noncontrolling interests 0    
Exercises of Put Right (53)    
Other 0 (1)  
Redeemable Noncontrolling Interest, Beginning balance 1,327 1,406  
Net income attributable to noncontrolling interests 43 44  
Other comprehensive income (loss) 185 (78)  
Reclassification of recurring compensation to other accrued liabilities (43) (44)  
Purchases of noncontrolling interests   0  
Payments to noncontrolling interests 0    
Other 0 (1)  
Redeemable Noncontrolling Interest, Ending balance $ 1,459 $ 1,327 $ 1,406