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Investments - Securities available for sale in a loss position (Details)
$ in Millions
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Fair Value    
Fair Value, Less than 12 Months $ 179,142 $ 58,573
Fair Value, 12 Months or More 16,614 12,293
Fair Value, Total 195,756 70,866
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 29,813 1,137
Gross Unrealized Losses, 12 Months or More 4,291 689
Gross Unrealized Losses, Total $ 34,104 $ 1,826
Number of securities in an unrealized loss position | security 36,267 15,029
Number of individual securities in continuous unrealized loss position for longer than twelve months | security 5,241 2,644
U.S. government and government sponsored entities    
Fair Value    
Fair Value, Less than 12 Months $ 6,560 $ 3,696
Fair Value, 12 Months or More 947 447
Fair Value, Total 7,507 4,143
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 588 14
Gross Unrealized Losses, 12 Months or More 91 13
Gross Unrealized Losses, Total 679 27
Obligations of states, municipalities and political subdivisions    
Fair Value    
Fair Value, Less than 12 Months 9,854 714
Fair Value, 12 Months or More 144 57
Fair Value, Total 9,998 771
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 1,225 11
Gross Unrealized Losses, 12 Months or More 31 4
Gross Unrealized Losses, Total 1,256 15
Non-U.S. governments    
Fair Value    
Fair Value, Less than 12 Months 8,824 4,644
Fair Value, 12 Months or More 2,382 1,324
Fair Value, Total 11,206 5,968
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 1,387 115
Gross Unrealized Losses, 12 Months or More 529 132
Gross Unrealized Losses, Total 1,916 247
Corporate debt    
Fair Value    
Fair Value, Less than 12 Months 110,817 31,914
Fair Value, 12 Months or More 11,263 8,819
Fair Value, Total 122,080 40,733
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 22,151 720
Gross Unrealized Losses, 12 Months or More 3,345 467
Gross Unrealized Losses, Total 25,496 1,187
RMBS    
Fair Value    
Fair Value, Less than 12 Months 10,909 5,362
Fair Value, 12 Months or More 513 1,154
Fair Value, Total 11,422 6,516
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 1,362 102
Gross Unrealized Losses, 12 Months or More 96 46
Gross Unrealized Losses, Total 1,458 148
CMBS    
Fair Value    
Fair Value, Less than 12 Months 13,068 3,980
Fair Value, 12 Months or More 335 153
Fair Value, Total 13,403 4,133
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 1,312 63
Gross Unrealized Losses, 12 Months or More 41 16
Gross Unrealized Losses, Total 1,353 79
CDO/ABS    
Fair Value    
Fair Value, Less than 12 Months 19,110 8,263
Fair Value, 12 Months or More 1,030 339
Fair Value, Total 20,140 8,602
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months 1,788 112
Gross Unrealized Losses, 12 Months or More 158 11
Gross Unrealized Losses, Total $ 1,946 $ 123