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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2024
Income Tax Disclosure [Abstract]  
Income Tax Rate Reconciliation
Income Tax Rate Reconciliation
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Tax provision at U.S. federal statutory rate$192 $141 $383 $278 
Nontaxable investment income(11)(9)(22)(20)
Other (7)(7)(29)(15)
Provision for income taxes$174 $125 $332 $243 
Summary of Income Tax Contingencies
Rollforward of Unrecognized Tax Benefits
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Balance, beginning of period$27 $23 $26 $22 
Gross increases - tax positions in current period— 
Lapse of statute of limitations— (1)— (1)
Balance, end of period$27 $23 $27 $23