CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (1,943)	$ 7,377	$ (1,206)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	(8)	14	(1)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(22)	36	(2)
Net unrealized holding (losses) gains on securities	1	12	0
Unrecognized net periodic pension and other postretirement benefits:
Net actuarial (loss) gain	(49)	(30)	35
Less: Amortization of actuarial loss, included in net loss	7	(1)	3
Net unrecognized net periodic pension and other postretirement benefits	(42)	(31)	38
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	(8)
Other comprehensive (loss) income	(71)	31	35
Comprehensive (loss)	$ (2,014)	$ 7,408	$ (1,171)