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Income Tax (Total Income Taxes Provided) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Provision for income taxes $ 251 $ 197 $ 215
Other Comprehensive Income (Loss), Tax (305) 271 (69)
Income Tax Expense (Benefit), Intraperiod Tax Allocation 556 (74) 284
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax [1] 449 2,542 530
AOCI, Liability for Future Policy Benefit, Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax (161) 2,224 580
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax 3 (5) 11
Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax (22) 35 (23)
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax $ 2 $ (7) $ (7)
[1] Includes cash flow hedges of $(218), $(205) and $(22) as of December 31, 2023, 2022 and 2021, respectively. See Note 12 for additional information on cash flow hedges.