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Redeemable Noncontrolling Interests and Noncontrolling Interests - Schedule of Changes in Redeemable Noncontrolling Interests and Noncontrolling Interests (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Noncontrolling Interests        
Beginning balance     $ 253  
Net income attributable to noncontrolling interests $ 54 $ 55 112 $ 111
Other comprehensive income (loss) (7)   (44)  
Ending balance 208   208  
Redeemable Noncontrolling Interests        
Beginning balance     1,459  
Other comprehensive income (loss) (7)   (44)  
Ending balance 1,415   1,415  
Noncontrolling Interest        
Noncontrolling Interests        
Beginning balance     253 178
Net income attributable to noncontrolling interests     89 91
Other comprehensive income (loss)     0 0
Payments of noncontrolling interests       (47)
Payments to noncontrolling interests     (106)  
Exercises of Put Right     0 0
Other     (28) (3)
Ending balance 208 219 208 219
Redeemable Noncontrolling Interests        
Other comprehensive income (loss)     0 0
Payments to noncontrolling interests     (106)  
Purchase of noncontrolling interests       (47)
Exercises of Put Right     0 0
Other     (28) (3)
Redeemable Noncontrolling Interest        
Noncontrolling Interests        
Other comprehensive income (loss)     (44) 149
Payments of noncontrolling interests       0
Payments to noncontrolling interests     0  
Exercises of Put Right     0 (53)
Other     0 0
Redeemable Noncontrolling Interests        
Beginning balance     1,459 1,327
Net income attributable to noncontrolling interests     23 20
Other comprehensive income (loss)     (44) 149
Reclassification of recurring compensation to other accrued liabilities     (23) (20)
Payments to noncontrolling interests     0  
Purchase of noncontrolling interests       0
Exercises of Put Right     0 (53)
Other     0 0
Ending balance $ 1,415 $ 1,423 $ 1,415 $ 1,423