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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2025
Income Tax Disclosure [Abstract]  
Income Tax Rate Reconciliation
Income Tax Rate Reconciliation
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Tax provision at U.S. federal statutory rate$277 $200 $703 $583 
Nontaxable net investment income(9)(9)(23)(31)
Uncertain tax position reserve(10)(4)(9)(3)
Tax credits(13)(2)(28)(10)
Other (7)— (1)(22)
Provision for income taxes$238 $185 $642 $517 
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Rollforward of Unrecognized Tax Benefits
 Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
Balance, beginning of period$25 $27 $24 $26 
Gross increases - tax positions in current period4 1 5 2 
Gross decreases - tax positions in current period— (1)— (1)
Lapse of statute of limitations(14)(4)(14)(4)
Balance, end of period$15 $23 $15 $23