Income Taxes (Provision For (Benefit From) Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Federal, Current	$ 203	$ 251	$ 258
State, Current	36	24	39
Foreign, Current	381	47	48
Total, Current	620	322	345
Federal, Deferred	(190)	(26)	(14)
State, Deferred	(26)	(2)	(2)
Foreign, Deferred	(112)	(114)	(1,860)
Total, Deferred	(328)	(142)	(1,876)
Total, Federal	13	225	244
Total, State	10	22	37
Total, Foreign	269	(67)	(1,812)
Total provision for (benefit from) income taxes	$ 292	$ 180	$ (1,531)