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Income Taxes (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2024
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense and Effective Income Tax Rates
 Three Months Ended September 30Nine Months Ended September 30
$ in millions2024202320242023
Federal and foreign income tax expense$162 $181 $555 $512 
Effective income tax rate13.6 %16.2 %16.0 %16.5 %