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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
	Jun. 30, 2019	Jun. 30, 2018
Noncontrolling Interests
Beginning balance	$ 193
Net income attributable to noncontrolling interests	54	$ 58
Other comprehensive income (loss)	6	(37)
Payments to noncontrolling interests	(39)	(64)
Ending balance	194
Redeemable Noncontrolling Interests
Beginning balance	1,393
Other comprehensive income (loss)	6	(37)
Payments to noncontrolling interests	(39)	(64)
Ending balance	1,399
Noncontrolling Interests
Noncontrolling Interests
Beginning balance	193	253
Net income attributable to noncontrolling interests	43	46
Other comprehensive income (loss)	0	0
Payments to noncontrolling interests		(64)
Payments to noncontrolling interests	(39)	(64)
Other	(3)	5
Ending balance	194	240
Redeemable Noncontrolling Interests
Other comprehensive income (loss)	0	0
Payments to noncontrolling interests	(39)	(64)
Purchase of noncontrolling interests		(64)
Other	(3)	5
Redeemable Noncontrolling Interest
Noncontrolling Interests
Other comprehensive income (loss)	6	(37)
Payments to noncontrolling interests		0
Payments to noncontrolling interests	0
Other	0	0
Redeemable Noncontrolling Interests
Beginning balance	1,393	1,459
Net income attributable to noncontrolling interests	11	12
Other comprehensive income (loss)	6	(37)
Reclassification of recurring compensation to other accrued liabilities	(11)	(12)
Payments to noncontrolling interests	0
Purchase of noncontrolling interests		0
Other	0	0
Ending balance	$ 1,399	$ 1,422

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