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Fair Value Measurements - Gross components of purchases, sales, issuances and settlements (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Assets:        
Purchases $ 1,193,000,000 $ 859,000,000 $ 3,425,000,000 $ 4,638,000,000
Sales (238,000,000) (194,000,000) (486,000,000) (258,000,000)
Issuances and Settlements (608,000,000) (707,000,000) (1,815,000,000) (3,179,000,000)
Purchases, Sales, Issuances and Settlements, Net 347,000,000 (42,000,000) 1,124,000,000 1,201,000,000
Liabilities:        
Purchases (302,000,000) (243,000,000) (752,000,000) (492,000,000)
Sales 357,000,000 242,000,000 1,094,000,000 662,000,000
Issuances and Settlements (124,000,000) (10,000,000) (1,047,000,000) (425,000,000)
Purchases, Sales, Issuances and Settlements, Net (69,000,000) (11,000,000) (705,000,000) (255,000,000)
Issuances, assets     0 0
Issuances, liabilities     0 0
Transfers into Level 3 at end of reporting period, net gains (losses) not included in realized and unrealized gains and losses related to Level 3 for the period 1,000,000 (25,000,000) 9,000,000 (98,000,000)
Transfers out Level 3 at end of reporting period, net gains (losses) included in realized and unrealized gains and losses related to Level 3 for the period. (21,000,000) (36,000,000) (35,000,000) (122,000,000)
Policyholder contract deposits        
Liabilities:        
Purchases 0 0 0 0
Sales 348,000,000 239,000,000 1,076,000,000 656,000,000
Issuances and Settlements (118,000,000) 50,000,000 (210,000,000) (8,000,000)
Purchases, Sales, Issuances and Settlements, Net 230,000,000 289,000,000 866,000,000 648,000,000
Derivative liabilities, net        
Liabilities:        
Purchases (302,000,000) (243,000,000) (752,000,000) (492,000,000)
Sales 9,000,000 3,000,000 18,000,000 6,000,000
Issuances and Settlements 152,000,000 50,000,000 189,000,000 159,000,000
Purchases, Sales, Issuances and Settlements, Net (141,000,000) (190,000,000) (545,000,000) (327,000,000)
Fortitude Re funds withheld payable        
Liabilities:        
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances and Settlements (158,000,000) (110,000,000) (1,026,000,000) (576,000,000)
Purchases, Sales, Issuances and Settlements, Net (158,000,000) (110,000,000) (1,026,000,000) (576,000,000)
Other Liabilities        
Liabilities:        
Purchases, Sales, Issuances and Settlements, Net 0   0  
Bonds available for sale        
Assets:        
Purchases 995,000,000 700,000,000 2,821,000,000 3,286,000,000
Sales (224,000,000) (71,000,000) (472,000,000) (135,000,000)
Issuances and Settlements (532,000,000) (568,000,000) (1,504,000,000) (2,298,000,000)
Purchases, Sales, Issuances and Settlements, Net 239,000,000 61,000,000 845,000,000 853,000,000
Bonds available for sale | Obligations of states, municipalities and political subdivisions        
Assets:        
Purchases 0 5,000,000 1,000,000 6,000,000
Sales (23,000,000) 0 (27,000,000) (64,000,000)
Issuances and Settlements 0 (34,000,000) (5,000,000) (36,000,000)
Purchases, Sales, Issuances and Settlements, Net (23,000,000) (29,000,000) (31,000,000) (94,000,000)
Bonds available for sale | Corporate debt        
Assets:        
Purchases 197,000,000 31,000,000 219,000,000 54,000,000
Sales (30,000,000) (49,000,000) (30,000,000) (49,000,000)
Issuances and Settlements (243,000,000) (82,000,000) (639,000,000) (142,000,000)
Purchases, Sales, Issuances and Settlements, Net (76,000,000) (100,000,000) (450,000,000) (137,000,000)
Bonds available for sale | RMBS        
Assets:        
Purchases 194,000,000 56,000,000 595,000,000 341,000,000
Sales (6,000,000) 0 (67,000,000) 0
Issuances and Settlements (262,000,000) (355,000,000) (803,000,000) (1,514,000,000)
Purchases, Sales, Issuances and Settlements, Net (74,000,000) (299,000,000) (275,000,000) (1,173,000,000)
Bonds available for sale | CMBS        
Assets:        
Purchases 0 27,000,000 10,000,000 173,000,000
Sales (7,000,000) 0 (39,000,000) 0
Issuances and Settlements 11,000,000 (60,000,000) (6,000,000) (89,000,000)
Purchases, Sales, Issuances and Settlements, Net 4,000,000 (33,000,000) (35,000,000) 84,000,000
Bonds available for sale | CLO/ABS        
Assets:        
Purchases 604,000,000 581,000,000 1,996,000,000 2,712,000,000
Sales (158,000,000) (22,000,000) (309,000,000) (22,000,000)
Issuances and Settlements (35,000,000) (36,000,000) (46,000,000) (516,000,000)
Purchases, Sales, Issuances and Settlements, Net 411,000,000 523,000,000 1,641,000,000 2,174,000,000
Bonds available for sale | Non-U.S. governments        
Assets:        
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances and Settlements (3,000,000) (1,000,000) (5,000,000) (1,000,000)
Purchases, Sales, Issuances and Settlements, Net (3,000,000) (1,000,000) (5,000,000) (1,000,000)
Other bond securities        
Assets:        
Purchases 124,000,000 98,000,000 347,000,000 769,000,000
Sales (12,000,000) (123,000,000) (12,000,000) (123,000,000)
Issuances and Settlements (72,000,000) (41,000,000) (286,000,000) (222,000,000)
Purchases, Sales, Issuances and Settlements, Net 40,000,000 (66,000,000) 49,000,000 424,000,000
Other bond securities | Obligations of states, municipalities and political subdivisions        
Assets:        
Purchases 0   3,000,000  
Sales (2,000,000)   (2,000,000)  
Issuances and Settlements 0   0  
Purchases, Sales, Issuances and Settlements, Net (2,000,000)   1,000,000  
Other bond securities | Corporate debt        
Assets:        
Purchases 89,000,000 2,000,000 176,000,000 26,000,000
Sales 0 0 0 0
Issuances and Settlements (24,000,000) 64,000,000 (183,000,000) 164,000,000
Purchases, Sales, Issuances and Settlements, Net 65,000,000 66,000,000 (7,000,000) 190,000,000
Other bond securities | RMBS        
Assets:        
Purchases 0 31,000,000 6,000,000 62,000,000
Sales 0 0 0 0
Issuances and Settlements (4,000,000) (5,000,000) (26,000,000) (22,000,000)
Purchases, Sales, Issuances and Settlements, Net (4,000,000) 26,000,000 (20,000,000) 40,000,000
Other bond securities | CMBS        
Assets:        
Purchases, Sales, Issuances and Settlements, Net 0 0 0 0
Other bond securities | CLO/ABS        
Assets:        
Purchases 35,000,000 65,000,000 162,000,000 681,000,000
Sales (10,000,000) (123,000,000) (10,000,000) (123,000,000)
Issuances and Settlements (44,000,000) (100,000,000) (77,000,000) (364,000,000)
Purchases, Sales, Issuances and Settlements, Net (19,000,000) (158,000,000) 75,000,000 194,000,000
Equity securities        
Assets:        
Purchases 0 8,000,000 31,000,000 13,000,000
Sales (2,000,000) 0 (2,000,000) 0
Issuances and Settlements 0 0 (2,000,000) 1,000,000
Purchases, Sales, Issuances and Settlements, Net (2,000,000) 8,000,000 27,000,000 14,000,000
Other invested assets        
Assets:        
Purchases 74,000,000 53,000,000 226,000,000 570,000,000
Sales 0 0 0 0
Issuances and Settlements (5,000,000) (98,000,000) (28,000,000) (653,000,000)
Purchases, Sales, Issuances and Settlements, Net 69,000,000 (45,000,000) 198,000,000 (83,000,000)
Other assets        
Assets:        
Purchases 0   0 0
Sales 0   0 0
Issuances and Settlements 1,000,000   5,000,000 (7,000,000)
Purchases, Sales, Issuances and Settlements, Net $ 1,000,000 $ 0 $ 5,000,000 $ (7,000,000)