Income Taxes - EGTS - 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)
Total	(1,582)	(1,699)	(1,916)
EGTS
Current:
Federal	8	(28)	5
State	12	(12)	12
Total current	20	(40)	17
Deferred:
Federal	58	91	64
State	9	28	28
Total deferred	67	119	92
Total	$ 87	$ 79	$ 109