Income Taxes (Unaudited) (Tables)

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense and Effective Income Tax Rates

	Three Months Ended June 30						Six Months Ended June 30
$ in millions	2020			2019			2020			2019
Federal and foreign income tax expense	$	198		$	167		$	383		$	338
Effective income tax rate	16.5		%	16.2		%	17.0		%	16.4		%