Income Taxes - Reconciliation of Income Tax Expense Computed at the Statutory Federal Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
Amount at statutory rate	$ 1,409	$ 1,660	$ 1,620
State and local income taxes, net of federal tax expense/benefit	121	216	124
Tax credits:
Energy-related tax credits	(86)
Other	(62)
Nontaxable or nondeductible items:
Legal entity restructuring	(176)
Other	(75)
Changes in unrecognized tax benefits	(71)
Tax exempt interest and dividends received deduction		(12)	(15)
Change in valuation allowance		43	84
Other, net	(11)	26	(89)
Total income tax expense	$ 1,049	$ 1,933	$ 1,724
Percent
Amount at statutory rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal tax expense/benefit	1.80%	2.70%	1.60%
Tax credits:
Energy-related tax credits	(1.30%)
Other	(0.90%)
Nontaxable or nondeductible items:
Legal entity restructuring	(2.60%)
Other	(1.10%)
Changes in unrecognized tax benefits	(1.10%)
Tax exempt interest and dividends received deduction		(0.10%)	(0.20%)
Change in valuation allowance		0.60%	1.10%
Other, net	(0.20%)	0.30%	(1.20%)
Total income tax expense	15.60%	24.50%	22.30%