Income Taxes (Reconciliation between the Company's federal income tax (expense) benefit at statutory rates and the recorded income tax (expense) benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
Income tax expense at statutory rates	$ (340)	$ (254)	$ (319)
State and local income taxes, net of federal income tax effect	(10)	(12)	(13)
Effect of cross-border tax laws	(6)	0	(1)
Foreign tax credits	25	36	26
Tax exempt income	30	26	31
Other nontaxable or nondeductible items	(10)	(9)	(7)
Income tax expense	$ (342)	$ (252)	$ (313)
Percent
Income tax expense at statutory rates	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax effect	0.60%	1.00%	0.80%
Effect of cross-border tax laws	0.30%	0.00%	0.00%
Foreign tax credits	(1.50%)	(3.00%)	(1.70%)
Tax exempt income	(1.80%)	(2.10%)	(2.00%)
Other nontaxable or nondeductible items	0.60%	0.80%	0.50%
Income tax expense	21.10%	20.90%	20.50%
Canada
Amount
Foreign tax effects	$ (22)	$ (32)	$ (23)
Percent
Foreign tax effects	1.40%	2.60%	1.50%
Other
Amount
Foreign tax effects	$ (9)	$ (7)	$ (7)
Percent
Foreign tax effects	0.50%	0.60%	0.40%