Income Taxes (Income Tax Provision Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 29
Asset impairments	$ (2)	(126)	$ 0
Singapore contract termination	0	$ (174)	$ 0
Accumulated but undistributed earnings permanently reinvested in business	$ 4,300
Effective income tax rate	12.00%	41.00%	33.00%
SINGAPORE
Tax Credit Carryforward [Line Items]
Singapore contract termination		$ (174)
Nanjing, China [Member]
Tax Credit Carryforward [Line Items]
Asset impairments		$ (123)