Income Taxes (Tables)

6 Months Ended

Jun. 30, 2013

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	2013		2012		2013		2012
Federal and foreign income tax expense	$236		$247		$459		$497
Effective income tax rate	32.6	%	34.0	%	32.0	%	33.5	%