Consolidated Statements of Shareholder's Equity - USD ($) $ in Millions	Total	Capital stock	Additional paid-in capital	Accumulated other comprehensive (loss) income	Retained earnings
Balance at Mar. 31, 2018	$ 12,880	$ 915	$ 2	$ (29)	$ 11,992
Cumulative-effect of change in accounting policy	(110)	0	0	12	(122)
Net income	92	0	0	0	92
Other comprehensive income (loss), net of tax	(4)	0	0	(4)	0
Balance at Jun. 30, 2018	12,858	915	2	(21)	11,962
Balance at Mar. 31, 2019	13,578	915	2	3	12,658
Net income	359	0	0	0	359
Other comprehensive income (loss), net of tax	10	0	0	10	0
Balance at Jun. 30, 2019	$ 13,947	$ 915	$ 2	$ 13	$ 13,017