Investments - Securities available for sale in a loss position (Details) $ in Millions	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Fair Value
Fair Value, Less than 12 Months	$ 173,000	$ 58,573
Fair Value, 12 Months or More	23,486	12,293
Fair Value, Total	196,486	70,866
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	26,605	1,137
Gross Unrealized Losses, 12 Months or More	5,132	689
Gross Unrealized Losses, Total	$ 31,737	$ 1,826
Number of securities in an unrealized loss position \| security	36,549	15,029
Number of individual securities in continuous unrealized loss position for longer than twelve months \| security	4,048	2,644
U.S. government and government sponsored entities
Fair Value
Fair Value, Less than 12 Months	$ 3,493	$ 3,696
Fair Value, 12 Months or More	1,816	447
Fair Value, Total	5,309	4,143
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	368	14
Gross Unrealized Losses, 12 Months or More	128	13
Gross Unrealized Losses, Total	496	27
Obligations of states, municipalities and political subdivisions
Fair Value
Fair Value, Less than 12 Months	8,697	714
Fair Value, 12 Months or More	73	57
Fair Value, Total	8,770	771
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	1,180	11
Gross Unrealized Losses, 12 Months or More	15	4
Gross Unrealized Losses, Total	1,195	15
Non-U.S. governments
Fair Value
Fair Value, Less than 12 Months	10,702	4,644
Fair Value, 12 Months or More	779	1,324
Fair Value, Total	11,481	5,968
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	1,526	115
Gross Unrealized Losses, 12 Months or More	191	132
Gross Unrealized Losses, Total	1,717	247
Corporate debt
Fair Value
Fair Value, Less than 12 Months	110,683	31,914
Fair Value, 12 Months or More	13,778	8,819
Fair Value, Total	124,461	40,733
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	19,756	720
Gross Unrealized Losses, 12 Months or More	3,609	467
Gross Unrealized Losses, Total	23,365	1,187
RMBS
Fair Value
Fair Value, Less than 12 Months	10,953	5,362
Fair Value, 12 Months or More	1,005	1,154
Fair Value, Total	11,958	6,516
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	1,293	102
Gross Unrealized Losses, 12 Months or More	182	46
Gross Unrealized Losses, Total	1,475	148
CMBS
Fair Value
Fair Value, Less than 12 Months	11,620	3,980
Fair Value, 12 Months or More	1,728	153
Fair Value, Total	13,348	4,133
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	1,094	63
Gross Unrealized Losses, 12 Months or More	326	16
Gross Unrealized Losses, Total	1,420	79
CLO/ABS
Fair Value
Fair Value, Less than 12 Months	16,852	8,263
Fair Value, 12 Months or More	4,307	339
Fair Value, Total	21,159	8,602
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months	1,388	112
Gross Unrealized Losses, 12 Months or More	681	11
Gross Unrealized Losses, Total	$ 2,069	$ 123

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Debt Securities, Gross Unrealized Losses

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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