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, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Noncontrolling Interests
Beginning balance			$ 217
Net income attributable to noncontrolling interests	$ 52	$ 56	152	$ 163
Other comprehensive income (loss)	25	10	(39)	(2)
Payments to noncontrolling interests	(41)	(39)	(134)	(115)
Ending balance	200		200
Redeemable Noncontrolling Interests
Beginning balance			1,402
Other comprehensive income (loss)	25	10	(39)	(2)
Payments to noncontrolling interests	(41)	(39)	(134)	(115)
Ending balance	1,292		1,292
Noncontrolling Interests
Noncontrolling Interests
Beginning balance	200	210	217	193
Net income attributable to noncontrolling interests	41	45	120	130
Other comprehensive income (loss)	0	0	0	0
Payments to noncontrolling interests	(41)	(39)	(134)	(115)
Other	0	(5)	(3)	3
Ending balance	200	211	200	211
Redeemable Noncontrolling Interests
Other comprehensive income (loss)	0	0	0	0
Payments to noncontrolling interests	(41)	(39)	(134)	(115)
Other	0	(5)	(3)	3
Redeemable Noncontrolling Interest
Noncontrolling Interests
Other comprehensive income (loss)	25	10	(65)	(2)
Payments to noncontrolling interests	0	0	0	0
Other	2	3	4	6
Redeemable Noncontrolling Interests
Beginning balance	1,265	1,384	1,402	1,393
Net income attributable to noncontrolling interests	11	11	32	33
Other comprehensive income (loss)	25	10	(65)	(2)
Reclassification of recurring compensation to other accrued liabilities	(11)	(11)	(32)	(33)
Payments to noncontrolling interests	0	0	0	0
Exercises of Put Right			(49)
Other	2	3	4	6
Ending balance	$ 1,292	$ 1,397	$ 1,292	$ 1,397