Income Taxes (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2020

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense and Effective Income Tax Rates

	Three Months Ended September 30						Nine Months Ended September 30
$ in millions	2020			2019			2020			2019
Federal and foreign income tax expense	$	181		$	122		$	564		$	460
Effective income tax rate	15.5		%	11.6		%	16.5		%	14.8		%