Fair Value Measurements - Changes in level 3 recurring fair value measurements, assets (Details) - USD ($) $ in Millions |
12 Months Ended |
Dec. 31, 2022 |
Dec. 31, 2021 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
$ 31,627
|
$ 31,578
|
Net Realized and Unrealized Gains (Losses) Included in Income |
666
|
1,332
|
Other Comprehensive Income (Loss) |
(3,929)
|
(352)
|
Purchases, Sales, Issuances and Settlements, Net |
689
|
(56)
|
Gross Transfers In |
3,785
|
1,879
|
Gross Transfers Out |
(4,191)
|
(2,692)
|
Other |
0
|
(62)
|
Fair Value End of Period |
28,647
|
31,627
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
154
|
661
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
$ (2,683)
|
$ 1,163
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Revenues
|
Revenues
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other comprehensive income (loss)
|
Other comprehensive income (loss)
|
Gross Transfers Out |
$ 5
|
|
Net realized gains/(losses) |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Total net realized gains (losses)
|
Total net realized gains (losses)
|
Bonds available for sale |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
$ 26,862
|
$ 26,889
|
Net Realized and Unrealized Gains (Losses) Included in Income |
612
|
653
|
Other Comprehensive Income (Loss) |
(3,907)
|
(339)
|
Purchases, Sales, Issuances and Settlements, Net |
1,704
|
670
|
Gross Transfers In |
3,311
|
1,732
|
Gross Transfers Out |
(3,683)
|
(2,681)
|
Other |
0
|
(62)
|
Fair Value End of Period |
24,899
|
26,862
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
(2,683)
|
1,163
|
Bonds available for sale | Net realized gains/(losses) |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(82)
|
(1)
|
Bonds available for sale | Obligations of states, municipalities and political subdivisions |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
1,431
|
2,105
|
Net Realized and Unrealized Gains (Losses) Included in Income |
1
|
15
|
Other Comprehensive Income (Loss) |
(533)
|
(9)
|
Purchases, Sales, Issuances and Settlements, Net |
(104)
|
(358)
|
Gross Transfers In |
40
|
0
|
Gross Transfers Out |
(11)
|
(260)
|
Other |
0
|
(62)
|
Fair Value End of Period |
824
|
1,431
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
(223)
|
254
|
Bonds available for sale | Non-U.S. governments |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
7
|
5
|
Net Realized and Unrealized Gains (Losses) Included in Income |
1
|
0
|
Other Comprehensive Income (Loss) |
3
|
(1)
|
Purchases, Sales, Issuances and Settlements, Net |
(10)
|
1
|
Gross Transfers In |
3
|
5
|
Gross Transfers Out |
(3)
|
(3)
|
Other |
0
|
0
|
Fair Value End of Period |
1
|
7
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
(1)
|
0
|
Bonds available for sale | Corporate debt |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
2,641
|
2,349
|
Net Realized and Unrealized Gains (Losses) Included in Income |
37
|
(20)
|
Other Comprehensive Income (Loss) |
(238)
|
(31)
|
Purchases, Sales, Issuances and Settlements, Net |
(87)
|
188
|
Gross Transfers In |
1,155
|
524
|
Gross Transfers Out |
(661)
|
(369)
|
Other |
0
|
0
|
Fair Value End of Period |
2,847
|
2,641
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
(217)
|
(141)
|
Bonds available for sale | RMBS |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
10,378
|
11,694
|
Net Realized and Unrealized Gains (Losses) Included in Income |
452
|
595
|
Other Comprehensive Income (Loss) |
(1,319)
|
(127)
|
Purchases, Sales, Issuances and Settlements, Net |
(1,511)
|
(1,163)
|
Gross Transfers In |
8
|
8
|
Gross Transfers Out |
(455)
|
(629)
|
Other |
0
|
0
|
Fair Value End of Period |
7,553
|
10,378
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
(504)
|
790
|
Bonds available for sale | CMBS |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
1,190
|
922
|
Net Realized and Unrealized Gains (Losses) Included in Income |
7
|
25
|
Other Comprehensive Income (Loss) |
(162)
|
(49)
|
Purchases, Sales, Issuances and Settlements, Net |
137
|
414
|
Gross Transfers In |
102
|
57
|
Gross Transfers Out |
(348)
|
(179)
|
Other |
0
|
0
|
Fair Value End of Period |
926
|
1,190
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
(133)
|
(55)
|
Bonds available for sale | CLO/ABS |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
11,215
|
9,814
|
Net Realized and Unrealized Gains (Losses) Included in Income |
114
|
38
|
Other Comprehensive Income (Loss) |
(1,658)
|
(122)
|
Purchases, Sales, Issuances and Settlements, Net |
3,279
|
1,588
|
Gross Transfers In |
2,003
|
1,138
|
Gross Transfers Out |
(2,205)
|
(1,241)
|
Other |
0
|
0
|
Fair Value End of Period |
12,748
|
11,215
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
(1,605)
|
315
|
Other bond securities |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
2,697
|
2,698
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(283)
|
27
|
Other Comprehensive Income (Loss) |
0
|
0
|
Purchases, Sales, Issuances and Settlements, Net |
(1,009)
|
(34)
|
Gross Transfers In |
411
|
6
|
Gross Transfers Out |
(289)
|
0
|
Other |
0
|
0
|
Fair Value End of Period |
1,527
|
2,697
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
(200)
|
41
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
0
|
0
|
Other bond securities | Net realized gains/(losses) |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Net Realized and Unrealized Gains (Losses) Included in Income |
0
|
0
|
Other bond securities | Corporate debt |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
134
|
0
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(5)
|
(1)
|
Other Comprehensive Income (Loss) |
0
|
0
|
Purchases, Sales, Issuances and Settlements, Net |
158
|
135
|
Gross Transfers In |
334
|
0
|
Gross Transfers Out |
(205)
|
0
|
Other |
0
|
0
|
Fair Value End of Period |
416
|
134
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
(2)
|
(1)
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
0
|
0
|
Other bond securities | RMBS |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
196
|
139
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(39)
|
3
|
Other Comprehensive Income (Loss) |
0
|
0
|
Purchases, Sales, Issuances and Settlements, Net |
16
|
54
|
Gross Transfers In |
0
|
0
|
Gross Transfers Out |
0
|
0
|
Other |
0
|
0
|
Fair Value End of Period |
173
|
196
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
(38)
|
(87)
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
0
|
0
|
Other bond securities | CMBS |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
35
|
47
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(6)
|
(3)
|
Other Comprehensive Income (Loss) |
0
|
0
|
Purchases, Sales, Issuances and Settlements, Net |
(1)
|
(15)
|
Gross Transfers In |
0
|
6
|
Gross Transfers Out |
0
|
0
|
Other |
0
|
0
|
Fair Value End of Period |
28
|
35
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
(4)
|
2
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
0
|
0
|
Other bond securities | CLO/ABS |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
2,332
|
2,512
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(233)
|
28
|
Other Comprehensive Income (Loss) |
0
|
0
|
Purchases, Sales, Issuances and Settlements, Net |
(1,182)
|
(208)
|
Gross Transfers In |
77
|
0
|
Gross Transfers Out |
(84)
|
0
|
Other |
0
|
0
|
Fair Value End of Period |
910
|
2,332
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
(156)
|
127
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
0
|
0
|
Equity securities |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
6
|
51
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(1)
|
11
|
Other Comprehensive Income (Loss) |
0
|
1
|
Purchases, Sales, Issuances and Settlements, Net |
27
|
(123)
|
Gross Transfers In |
16
|
77
|
Gross Transfers Out |
(9)
|
(11)
|
Other |
0
|
0
|
Fair Value End of Period |
39
|
6
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
(1)
|
3
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
0
|
0
|
Equity securities | Net realized gains/(losses) |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Net Realized and Unrealized Gains (Losses) Included in Income |
0
|
0
|
Other invested assets |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
1,948
|
1,827
|
Net Realized and Unrealized Gains (Losses) Included in Income |
338
|
641
|
Other Comprehensive Income (Loss) |
(22)
|
(14)
|
Purchases, Sales, Issuances and Settlements, Net |
(26)
|
(570)
|
Gross Transfers In |
47
|
64
|
Gross Transfers Out |
(210)
|
0
|
Other |
0
|
0
|
Fair Value End of Period |
2,075
|
1,948
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
355
|
617
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
0
|
0
|
Other invested assets | Net realized gains/(losses) |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Net Realized and Unrealized Gains (Losses) Included in Income |
(8)
|
11
|
Other assets |
|
|
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
Fair Value Beginning of Period |
114
|
113
|
Net Realized and Unrealized Gains (Losses) Included in Income |
0
|
0
|
Other Comprehensive Income (Loss) |
0
|
0
|
Purchases, Sales, Issuances and Settlements, Net |
(7)
|
1
|
Gross Transfers In |
0
|
0
|
Gross Transfers Out |
0
|
0
|
Other |
0
|
0
|
Fair Value End of Period |
107
|
114
|
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |
0
|
0
|
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period |
$ 0
|
$ 0
|