Income Taxes (Deferred Income Taxes Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Income Tax Disclosure [Abstract]
Valuation allowance change	$ 35
Valuation allowance, deferred tax asset, change in amount, income tax expense	124
Valuation allowance, deferred tax asset, change in amount, foreign currency translation adjustment	22
Net operating loss expirations	$ 67