Income Taxes (Unaudited) (Tables)

6 Months Ended

Jun. 30, 2019

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	2019			2018			2019			2018
Federal and foreign income tax expense	$	167		$	187		$	338		$	346
Effective income tax rate	16.2		%	19.2		%	16.4		%	17.5		%