Redeemable Noncontrolling Interests and Noncontrolling Interests - Schedule of Changes in Redeemable Noncontrolling Interests and Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Noncontrolling Interests
Beginning balance	$ 217
Net income attributable to noncontrolling interests	50	$ 54
Other comprehensive income (loss)	61	6
Payments to noncontrolling interests	(43)	(39)
Ending balance	207
Redeemable Noncontrolling Interests
Beginning balance	1,402
Other comprehensive income (loss)	61	6
Payments to noncontrolling interests	(43)	(39)
Ending balance	1,414
Noncontrolling Interests
Noncontrolling Interests
Beginning balance	217	193
Net income attributable to noncontrolling interests	39	43
Other comprehensive income (loss)	0	0
Payments to noncontrolling interests	(43)	(39)
Other	(6)	(3)
Ending balance	207	194
Redeemable Noncontrolling Interests
Other comprehensive income (loss)	0	0
Payments to noncontrolling interests	(43)	(39)
Other	(6)	(3)
Redeemable Noncontrolling Interest
Noncontrolling Interests
Other comprehensive income (loss)	61	6
Payments to noncontrolling interests	0	0
Other	0	0
Redeemable Noncontrolling Interests
Beginning balance	1,402	1,393
Net income attributable to noncontrolling interests	11	11
Other comprehensive income (loss)	61	6
Reclassification of recurring compensation to other accrued liabilities	(11)	(11)
Payments to noncontrolling interests	0	0
Exercises of Put Right	(49)
Other	0	0
Ending balance	$ 1,414	$ 1,399