Income Taxes (Unaudited) Effective Income Tax Rate Reconciliation (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 155	$ 97
Federal and foreign income tax expense	$ (155)	$ (97)
Effective income tax rate	15.00%	16.80%
Change in Federal and foreign income tax expense	$ 58
Change in Federal and foreign income tax expense, percent	60.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 68	$ 34
Income Tax Reconciliation Deductions FDII	(9)	(6)
Income Taxes Receivable	1,100		$ 924
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	19	16
Increase (Decrease) in Earnings before Income Taxes	452
Effect of New Tax Legislation [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	68	$ 34
IRS Notice 2026-7 [Member]
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	19
Effect of New Tax Legislation [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	19
Corporate Alternative Minimum Tax | OBBBA [Member]
Effect of New Tax Legislation [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax			$ 187
Corporate Alternative Minimum Tax | IRS Notice 2026-7 [Member]
Effect of New Tax Legislation [Line Items]
Increase (Decrease) in Deferred Income Taxes	$ (187)