SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - STATEMENT OF COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Statement of Income Captions [Line Items]
Net income, pretax amount, attributable to parent	$ 2,538	$ 3,081	$ 3,565
Income tax benefit (expense)	(701)	(219)	(490)
Net income, after tax amount, attributable to parent	1,837	2,862	3,075
Foreign currency translation adjustments, pretax amount, attributable to parent	21	(30)	23
Foreign currency translation adjustments, income tax (expense) benefit, attributable to parent	0	0	0
Foreign currency translation adjustments, net of tax amount, attributable to parent	21	(30)	23
Financial instruments, pretax amount, attributable to parent	(76)	14	57
Financial instruments, income tax (expense) benefit, attributable to parent	7	(2)	(18)
Financial instruments, net of tax amount, attributable to parent	(69)	12	39
Pension and other postretirement benefits, pretax amount, attributable to parent	19	18	(39)
Pension and other postretirement benefits, income tax (expense) benefit, attributable to parent	(2)	(16)	8
Pension and other postretirement benefits, net of tax amount, attributable to parent	17	2	(31)
Total other comprehensive income (loss), pretax amount, attributable to parent	(36)	2	41
Total other comprehensive income, income (loss) tax (expense) benefit, attributable to parent	5	(18)	(10)
Net OCI	(31)	(16)	31
Comprehensive income, after preferred dividends of subsidiary, pretax amount, attributable to parent	2,501	3,082	3,605
Comprehensive income, after preferred dividends of subsidiary, income tax (expense) benefit, attributable to parent	(696)	(237)	(500)
Comprehensive income, after preferred dividends of subsidiary	1,805	2,845	3,105
Parent Company
Condensed Statement of Income Captions [Line Items]
Net income, pretax amount, attributable to parent	1,640	2,696	2,940
Income tax benefit (expense)	196	165	134
Net income, after tax amount, attributable to parent	1,836	2,861	3,074
Foreign currency translation adjustments, pretax amount, attributable to parent	21	(30)	23
Foreign currency translation adjustments, income tax (expense) benefit, attributable to parent	0	0	0
Foreign currency translation adjustments, net of tax amount, attributable to parent	21	(30)	23
Financial instruments, pretax amount, attributable to parent	(76)	14	57
Financial instruments, income tax (expense) benefit, attributable to parent	7	(2)	(18)
Financial instruments, net of tax amount, attributable to parent	(69)	12	39
Pension and other postretirement benefits, pretax amount, attributable to parent	19	18	(39)
Pension and other postretirement benefits, income tax (expense) benefit, attributable to parent	(2)	(16)	8
Pension and other postretirement benefits, net of tax amount, attributable to parent	17	2	(31)
Total other comprehensive income (loss), pretax amount, attributable to parent	(36)	2	41
Total other comprehensive income, income (loss) tax (expense) benefit, attributable to parent	5	(18)	(10)
Net OCI	(31)	(16)	31
Comprehensive income, after preferred dividends of subsidiary, pretax amount, attributable to parent	1,604	2,698	2,981
Comprehensive income, after preferred dividends of subsidiary, income tax (expense) benefit, attributable to parent	201	147	124
Comprehensive income, after preferred dividends of subsidiary	$ 1,805	$ 2,845	$ 3,105