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, 2024	$ 16,982	$ 915	$ 2	$ (65)	$ 16,130
Net income	1,215	0	0	0	1,215
Other comprehensive income (loss), net of tax	(2)	0	0	(2)	0
Balance at Dec. 31, 2024	18,195	915	2	(67)	17,345
Balance at Sep. 30, 2024	17,787	915	2	(46)	16,916
Net income	429	0	0	0	429
Other comprehensive income (loss), net of tax	(21)	0	0	(21)	0
Balance at Dec. 31, 2024	18,195	915	2	(67)	17,345
Balance at Mar. 31, 2025	17,243	915	2	(56)	16,382
Net income	1,896	0	0	0	1,896
Other comprehensive income (loss), net of tax	10	0	0	10	0
Balance at Dec. 31, 2025	19,149	915	2	(46)	18,278
Balance at Sep. 30, 2025	18,669	915	2	(47)	17,799
Net income	479	0	0	0	479
Other comprehensive income (loss), net of tax	1	0	0	1	0
Balance at Dec. 31, 2025	$ 19,149	$ 915	$ 2	$ (46)	$ 18,278