SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - STATEMENT OF COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Statement of Income Captions [Line Items]
Net income, pretax amount, attributable to parent	$ 3,565	$ 2,695	$ 1,417
Income tax expense	(490)	(556)	(99)
Net income	3,618	2,285	1,463
Foreign currency translation adjustments, pretax amount, attributable to parent	23	11	(6)
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	23	11	(6)
Financial instruments, pretax amount, attributable to parent	57	221	191
Financial instruments, income tax (expense) benefit, attributable to parent	(18)	(55)	(47)
Financial instruments, net of tax amount, attributable to parent	39	166	144
Pension and other postretirement benefits, pretax amount, attributable to parent	(39)	3	28
Pension and other postretirement benefits, income tax (expense) benefit, attributable to parent	8	(6)	(6)
Pension and other postretirement benefits, net of tax amount, attributable to parent	(31)	(3)	22
Total other comprehensive income, pretax amount, attributable to parent	41	235	213
Total other comprehensive income, income tax (expense) benefit, attributable to parent	(10)	(61)	(53)
Total other comprehensive income, net of tax amount, attributable to parent	31	174	160
Comprehensive income, after preferred dividends of subsidiary, pretax amount, attributable to parent	3,605	2,929	1,629
Comprehensive income, after preferred dividends of subsidiary, income tax (expense) benefit, attributable to parent	(500)	(617)	(152)
Comprehensive income, after preferred dividends of subsidiary	3,105	2,312	1,477
Parent Company
Condensed Statement of Income Captions [Line Items]
Net income, pretax amount, attributable to parent	2,940	2,027	1,127
Income tax expense	134	111	190
Net income	3,074	2,138	1,317
Foreign currency translation adjustments, pretax amount, attributable to parent	23	11	(6)
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	23	11	(6)
Financial instruments, pretax amount, attributable to parent	57	221	191
Financial instruments, income tax (expense) benefit, attributable to parent	(18)	(55)	(47)
Financial instruments, net of tax amount, attributable to parent	39	166	144
Pension and other postretirement benefits, pretax amount, attributable to parent	(39)	3	28
Pension and other postretirement benefits, income tax (expense) benefit, attributable to parent	8	(6)	(6)
Pension and other postretirement benefits, net of tax amount, attributable to parent	(31)	(3)	22
Total other comprehensive income, pretax amount, attributable to parent	41	235	213
Total other comprehensive income, income tax (expense) benefit, attributable to parent	(10)	(61)	(53)
Total other comprehensive income, net of tax amount, attributable to parent	31	174	160
Comprehensive income, after preferred dividends of subsidiary, pretax amount, attributable to parent	2,981	2,262	1,340
Comprehensive income, after preferred dividends of subsidiary, income tax (expense) benefit, attributable to parent	124	50	137
Comprehensive income, after preferred dividends of subsidiary	$ 3,105	$ 2,312	$ 1,477