Income Taxes (Unaudited) Effective Income Tax Rate Reconciliation (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 223	$ 162	$ 573	$ 555
Effective income tax rate	16.90%	13.60%	17.20%	16.00%
Change in Federal and foreign income tax expense	$ 61		$ 18
Change in Federal and foreign income tax expense, percent	38.00%		3.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 66	$ 191	$ 169	$ 280
Income Tax Reconciliation Deductions FDII	(16)	41	(34)	(11)
Income Taxes Receivable	786		786		$ 517
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	19	$ 64	53	$ 110
Tax expense, nondeductible Goodwill, amount			$ 17
OBBBA [Member]
Income Tax Disclosure [Abstract]
Increase (Decrease) in Income Taxes Receivable	346
Increase (Decrease) in Deferred Income Taxes	$ 383