Consolidated Statements of Shareholder's Equity - USD ($) $ in Millions	Total	Capital stock	Additional paid-in capital	Accumulated other comprehensive loss	Retained earnings
Balance at Mar. 31, 2022	$ 18,101	$ 915	$ 2	$ (21)	$ 17,205
Net income	289	0	0	0	289
Other comprehensive loss, net of tax	(49)	0	0	(49)	0
Balance at Sep. 30, 2022	18,341	915	2	(70)	17,494
Balance at Jun. 30, 2022	18,245	915	2	(47)	17,375
Net income	119	0	0	0	119
Other comprehensive loss, net of tax	(23)	0	0	(23)	0
Balance at Sep. 30, 2022	18,341	915	2	(70)	17,494
Balance at Mar. 31, 2023	16,509	915	2	(57)	15,649
Net income	715	0	0	0	715
Other comprehensive loss, net of tax	(30)	0	0	(30)	0
Balance at Sep. 30, 2023	17,194	915	2	(87)	16,364
Balance at Jun. 30, 2023	16,969	915	2	(65)	16,117
Net income	247	0	0	0	247
Other comprehensive loss, net of tax	(22)	0	0	(22)	0
Balance at Sep. 30, 2023	$ 17,194	$ 915	$ 2	$ (87)	$ 16,364