Income Taxes Effective Income Tax Rate Reconciliation (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]
Total federal and foreign income taxes	$ 886	$ 842	$ 290
Effective income tax rate	17.50%	16.80%	12.40%
Accounting Standards Update 2023-09 Prospective [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 1,064
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	$ 15
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	0.30%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%
Effective Income Tax Rate Reconciliation, FDII, Amount	$ (49)
Effective Income Tax Rate Reconciliation, FDII, Percent	(1.00%)
Effective Income Tax Rate Reconciliation, Cross-Border, Other, Amount	$ 1
Effective Income Tax Rate Reconciliation, Cross-Border, Other, Percent	0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ (242)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	(4.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	$ (2)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 0
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount	$ 11
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent	0.20%
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	$ 69
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent	1.40%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount	$ 17
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent	0.30%
Other, net	$ 2
Other net, Percent	0.00%
Total federal and foreign income taxes	$ 886
Effective income tax rate	17.50%
Pre-ASU 2023-09
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount		$ 1,053	$ 493
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%
Effective Income Tax Rate Reconciliation, FDII, Amount		$ 13	$ (63)
Effective Income Tax Rate Reconciliation, FDII, Percent		0.30%	(2.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		$ (361)	$ (210)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent		(7.20%)	(8.90%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount		$ 145	$ 69
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent		2.90%	2.90%
Other, net		$ (8)	$ 1
Other net, Percent		(0.20%)	0.10%
Total federal and foreign income taxes		$ 842	$ 290
Effective income tax rate		16.80%	12.40%