Income Taxes (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2019

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	2019			2018			2019			2018
Federal and foreign income tax expense	$	122		$	120		$	460		$	466
Effective income tax rate	11.6		%	8.8		%	14.8		%	14.0		%