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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		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interests
Beginning balance			$ 193
Net income attributable to noncontrolling interests	$ 56	$ 57	163	$ 169
Other comprehensive income (loss)	10	(11)	(2)	(55)
Payments to noncontrolling interests	(39)	(37)	(115)	(143)
Ending balance	211		211
Redeemable Noncontrolling Interests
Beginning balance			1,393
Other comprehensive income (loss)	10	(11)	(2)	(55)
Payments to noncontrolling interests	(39)	(37)	(115)	(143)
Ending balance	1,397		1,397
Noncontrolling Interests
Noncontrolling Interests
Beginning balance	210	208	193	253
Net income attributable to noncontrolling interests	45	46	130	135
Other comprehensive income (loss)	0	0	0	0
Payments to noncontrolling interests	(39)	(37)	(115)	(143)
Other	(5)	(13)	3	(41)
Ending balance	211	204	211	204
Redeemable Noncontrolling Interests
Other comprehensive income (loss)	0	0	0	0
Payments to noncontrolling interests	(39)	(37)	(115)	(143)
Other	(5)	(13)	3	(41)
Redeemable Noncontrolling Interest
Noncontrolling Interests
Other comprehensive income (loss)	10	(11)	(2)	(55)
Payments to noncontrolling interests	0	0	0	0
Other	3	0	6	0
Redeemable Noncontrolling Interests
Beginning balance	1,384	1,415	1,393	1,459
Net income attributable to noncontrolling interests	11	11	33	34
Other comprehensive income (loss)	10	(11)	(2)	(55)
Reclassification of recurring compensation to other accrued liabilities	(11)	(11)	(33)	(34)
Payments to noncontrolling interests	0	0	0	0
Other	3	0	6	0
Ending balance	$ 1,397	$ 1,404	$ 1,397	$ 1,404

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