Consolidated Statements of Shareholder's Equity - USD ($) $ in Millions	Total	Cumulative Effect Period of Adoption Adjustment	Capital stock	Additional paid-in capital	Accumulated other comprehensive income	Retained earnings	Retained earnings Cumulative Effect Period of Adoption Adjustment
Balance at Mar. 31, 2020	$ 14,503		$ 915	$ 2	$ 15	$ 13,571
Balance (ASU 2016-13) at Mar. 31, 2020		$ (218)					$ (218)
Net income	374		0	0	0	374
Other comprehensive income, net of tax	12		0	0	12	0
Balance at Jun. 30, 2020	14,671		915	2	27	13,727
Balance at Mar. 31, 2021	15,595		915	2	8	14,670
Net income	921		0	0	0	921
Other comprehensive income, net of tax	9		0	0	9	0
Balance at Jun. 30, 2021	$ 16,525		$ 915	$ 2	$ 17	$ 15,591