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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2023
Income Tax Disclosure [Abstract]  
Income Tax Rate Reconciliation
Income Tax Rate Reconciliation
Three Months Ended March 31,
20232022
Tax provision at U.S. federal statutory rate$137 $114 
Nontaxable investment income(11)(9)
Executive compensation
Stock-based compensation(12)(10)
Other (2)(4)
Provision for income taxes$118 $98 
Roll-forward of Unrecognized Tax Benefits
Rollforward of Unrecognized Tax Benefits
 
Three Months Ended March 31,
 20232022
Balance, beginning of period$22 $16 
Gross increases - tax positions in current period
Balance, end of period$23 $17