Statutory Information - Summary of statutory capital, surplus and net income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Bermuda
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	[1]	$ 24,120	$ 19,546
Required statutory capital and surplus	[1]	7,112	6,450
Statutory net income (loss)		3,519	1,730	$ 2,371
Ireland
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	[1]	1,148	968
Required statutory capital and surplus	[1]	942	815
Statutory net income (loss)		53	(53)	25
United States
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	[1]	6,897	6,195
Required statutory capital and surplus	[1]	1,895	1,749
Statutory net income (loss)		592	220	346
United Kingdom
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	[1]	1,367	1,018
Required statutory capital and surplus	[1]	1,192	543
Statutory net income (loss)		72	57	35
Canada
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	[1]	83	69
Required statutory capital and surplus	[1]	53	48
Statutory net income (loss)		6	9	7
Australia
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	[1]	366	285
Required statutory capital and surplus	[1]	179	176
Statutory net income (loss)		$ 68	$ 39	$ 12

[1] Such amounts include ownership interests in affiliated insurance and reinsurance subsidiaries.