Income Taxes (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2013

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	2013		2012		2013		2012
Federal and foreign income tax expense	$223		$236		$682		$733
Effective income tax rate	31.0	%	34.0	%	31.6	%	33.7	%