Schedule II - Condensed Financial Information of Registrant - Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities:
Net Cash Provided by (Used in) Operating Activities	$ 5,749	$ 3,816	$ 3,425
Investing Activities:
Net (purchases) sales of short-term investments	(696)	467	165
Purchases of fixed assets	(52)	(50)	(41)
Other	(23)	125	(524)
Net cash used for investing activities	(5,468)	(3,101)	(2,138)
Financing Activities:
Purchases of common shares under share repurchase program	0	(586)	(1,234)
Proceeds from common shares issued, net	(2)	6	6
Proceeds from issuance of preferred shares, net	0	0	486
Redemption of preferred shares	0	0	(450)
Preferred dividends paid	(40)	(40)	(47)
Net Cash Provided by (Used in) Financing Activities	(69)	(706)	(1,229)
Increase (decrease) in cash and restricted cash	225	(41)	24
Cash and restricted cash, beginning of year	1,273	1,314	1,290
Cash and restricted cash, end of year	1,498	1,273	1,314
Parent
Operating Activities:
Net Cash Provided by (Used in) Operating Activities	46	621	1,728
Investing Activities:
Net (purchases) sales of short-term investments	(8)	(5)	(2)
Capital contributed to subsidiaries	0	0	(487)
Purchases of fixed assets	0	0	(1)
Other	1	(1)	0
Net cash used for investing activities	(7)	(6)	(490)
Financing Activities:
Purchases of common shares under share repurchase program	0	(586)	(1,234)
Proceeds from common shares issued, net	(2)	6	6
Proceeds from issuance of preferred shares, net	0	0	486
Redemption of preferred shares	0	0	(450)
Preferred dividends paid	(40)	(40)	(48)
Net Cash Provided by (Used in) Financing Activities	(42)	(620)	(1,240)
Increase (decrease) in cash and restricted cash	(3)	(5)	(2)
Cash and restricted cash, beginning of year	12	17	19
Cash and restricted cash, end of year	$ 9	$ 12	$ 17