Income Taxes (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense and Effective Income Tax Rates

	Three Months Ended March 31
$ in millions	2019			2018
Federal and foreign income tax expense	$	171		$	159
Effective income tax rate	16.5		%	15.9		%