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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Oct. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Contingency [Line Items]
Federal research and development credits		$ 6	$ 2
Domestic production activities deduction		12	7
Deferred Tax Assets, Net, Current		149		$ 50
Proceeds from Income Tax Refunds		32
Subsequent Event [Member]
Income Tax Contingency [Line Items]
Proceeds from Income Tax Refunds	$ 81
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Adjustment of deferred tax balances		$ 16	$ 11