Income Taxes - PAC - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ (1,333)	$ (1,650)	$ (1,463)
State	(16)	118	(65)
Total current	(1,315)	(1,442)	(1,449)
Deferred:
Federal	(371)	(114)	(408)
State	(29)	(275)	(49)
Total deferred	(306)	(356)	(462)
Investment tax credits	39	99	(5)
Total	(1,582)	(1,699)	(1,916)
PAC
Current:
Federal	(234)	(324)	(216)
State	7	(5)	(3)
Total current	(227)	(329)	(219)
Deferred:
Federal	(9)	(172)	90
State	1	(51)	71
Total deferred	(8)	(223)	161
Investment tax credits	(1)	(1)	(4)
Total	$ (236)	$ (553)	$ (62)