Income Taxes (Unaudited) (Tables)

6 Months Ended

Jun. 30, 2015

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	2015			2014			2015			2014
Federal and foreign income tax expense	$	205		$	245		$	425		$	452
Effective income tax rate	27.9		%	32.4		%	29.5		%	29.3		%