Consolidated Statements of Shareholder's Equity - USD ($) $ in Millions	Total	Capital stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Retained earnings
Balance at Mar. 31, 2017	$ 9,524	$ 915	$ 2	$ 25	$ 8,582
Net income	165	0	0	0	165
Other comprehensive loss, net of tax	(8)	0	0	(8)	0
Balance at Jun. 30, 2017	9,681	915	2	17	8,747
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 loss, net of tax	(4)	0	0	(4)	0
Balance at Jun. 30, 2018	$ 12,858	$ 915	$ 2	$ (21)	$ 11,962