Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense (benefit) from continuing operations	$ 56	$ 94	$ 206	$ 197
Other Tax Expense (Benefit)	175
Deferred Tax Assets, Capital Loss Carryforwards	$ 93		$ 93