Schedule II - Condensed Financial Information of Registrant - Balance Sheet (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Total investments	$ 40,540	$ 33,856
Cash	979	917	$ 855
Investment in operating affiliates	1,240	1,119
Other assets	6,231	4,761
Total assets	70,906	58,906	47,990
Liabilities
Senior notes	2,728	2,726
Other liabilities	3,039	1,942
Total liabilities	50,086	40,551	35,069
Shareholders’ Equity
Non-cumulative preferred shares	830	830
Common shares ($0.0011 par, shares issued: 595.6 and 591.9)	1	1
Additional paid-in capital	2,510	2,327
Retained earnings	22,686	20,295
Accumulated other comprehensive income (loss), net of deferred income tax	(720)	(676)	(1,646)	$ (65)
Common shares held in treasury, at cost (shares: 219.2 and 218.5)	(4,487)	(4,424)
Total shareholders' equity	20,820	18,353	$ 12,910
Total liabilities and shareholders' equity	$ 70,906	$ 58,906
Parenthetical information:
Common shares, par value per share	$ 0.0011	$ 0.0011
Common shares issued (shares)	595.6	591.9	588.3	583.3
Common shares held in treasury (shares)	219.2	218.5	217.9
Parent Company
Assets
Total investments	$ 43	$ 17
Cash	13	9
Investment in subsidiaries	22,035	19,590
Investment in operating affiliates	3	4
Due from subsidiaries and affiliates	6	0
Other assets	66	58
Total assets	22,166	19,678
Liabilities
Senior notes	1,287	1,287
Due to subsidiaries and affiliates	11	0
Other liabilities	48	38
Total liabilities	1,346	1,325
Shareholders’ Equity
Non-cumulative preferred shares	830	830
Common shares ($0.0011 par, shares issued: 595.6 and 591.9)	1	1
Additional paid-in capital	2,510	2,327
Retained earnings	22,686	20,295
Accumulated other comprehensive income (loss), net of deferred income tax	(720)	(676)
Common shares held in treasury, at cost (shares: 219.2 and 218.5)	(4,487)	(4,424)
Total shareholders' equity	20,820	18,353
Total liabilities and shareholders' equity	$ 22,166	$ 19,678
Parenthetical information:
Common shares, par value per share	$ 0.0011	$ 0.0011
Common shares issued (shares)	595.6	591.9
Common shares held in treasury (shares)	219.2	218.5