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Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component    
Balance at beginning of period $ 75,381 $ 69,701
Other comprehensive loss (1,155) (392)
Balance at end of period 74,140 71,164
Net unrealized investment gains (losses)    
Changes in Accumulated Other Comprehensive Income (Loss) by Component    
Balance at beginning of period 778 1,214
Other comprehensive income (loss) before reclassifications, net of tax (1,230) (400)
Amounts reclassified from accumulated other comprehensive income, net of tax 75 14
Other comprehensive loss (1,155) (386)
Balance at end of period (377) 828
OCI before reclassifications, pre-tax (1,405) (487)
Amounts reclassified, pre-tax 77 17
Foreign currency translation adjustments    
Changes in Accumulated Other Comprehensive Income (Loss) by Component    
Balance at beginning of period 0 7
Other comprehensive income (loss) before reclassifications, net of tax 3 (2)
Other comprehensive loss 3 (2)
Balance at end of period 3 5
Net cash flow hedges    
Changes in Accumulated Other Comprehensive Income (Loss) by Component    
Balance at beginning of period 222 248
Amounts reclassified from accumulated other comprehensive income, net of tax (3) (4)
Other comprehensive loss (3) (4)
Balance at end of period 219 244
Amounts reclassified, pre-tax (4) (5)
Amount expected to be reclassified 11  
Pension and other postretirement benefits    
Changes in Accumulated Other Comprehensive Income (Loss) by Component    
Balance at beginning of period (35) (55)
Other comprehensive loss 0 0
Balance at end of period (35) (55)
AOCI Including Portion Attributable to Noncontrolling Interest    
Changes in Accumulated Other Comprehensive Income (Loss) by Component    
Balance at beginning of period 965 1,414
Balance at end of period $ (190) $ 1,022