Income Taxes (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense and Effective Income Tax Rates

	Three Months Ended March 31
$ in millions	2016			2015
Federal and foreign income tax expense	$	120		$	220
Effective income tax rate	17.8		%	31.3		%