Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Flows from Operating Activities
Net income	$ 1,278	$ 959	$ 1,205
Adjustments to reconcile net income to net cash flows provided by operating activities:
Net investment losses	81	81	99
Other, net	(76)	420	(192)
Net cash flows provided by operating activities	2,490	2,571	2,285
Cash Flows from Investing Activities
Change in short-term investments	(151)	147	(274)
Other, net	(8)	0	(5)
Net cash flows used by investing activities	(1,449)	(1,317)	(1,843)
Cash Flows from Financing Activities
Dividends paid to common stockholders	(1,047)	(1,025)	(787)
Proceeds from the issuance of debt	495	490	491
Repayment of debt	(500)	(550)	(243)
Purchase of treasury stock	(34)	(20)	(24)
Other, net	(18)	(12)	(14)
Net cash flows used by financing activities	(1,104)	(1,117)	(577)
Net change in cash	(47)	127	(130)
Cash, beginning of year	472	345	475
Cash, end of year	425	472	345
Parent Company
Cash Flows from Operating Activities
Net income	1,278	959	1,205
Adjustments to reconcile net income to net cash flows provided by operating activities:
Equity in net income of subsidiaries	(1,376)	(1,044)	(1,288)
Dividends received from subsidiaries	1,115	995	1,055
Other, net	10	9	2
Net cash flows provided by operating activities	1,027	919	974
Cash Flows from Investing Activities
Change in short-term investments	84	204	(395)
Capital contributions to subsidiaries	(7)	(6)	(3)
Net cash flows used by investing activities	77	198	(398)
Cash Flows from Financing Activities
Dividends paid to common stockholders	(1,047)	(1,025)	(787)
Proceeds from the issuance of debt	495	490	491
Repayment of debt	(500)	(550)	(243)
Purchase of treasury stock	(34)	(20)	(24)
Other, net	(18)	(12)	(14)
Net cash flows used by financing activities	(1,104)	(1,117)	(577)
Net change in cash	0	0	(1)
Cash, beginning of year	1	1	2
Cash, end of year	$ 1	$ 1	$ 1