Income Taxes (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2015

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	2015			2014			2015			2014
Federal and foreign income tax expense	$	213		$	221		$	638		$	673
Effective income tax rate	29.2		%	31.8		%	29.4		%	30.1		%