Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Number of days past due to reach non accrual status	90 days
Restricted cash	$ 61	$ 82
Accounting Standards Update 2016-13 [Member]
Property, Plant and Equipment [Line Items]
Percentage of assets within scope	2.00%
Maximum [Member]
Property, Plant and Equipment [Line Items]
Definite-lived intangible assets useful life maximum, years	25 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment	25 years
Maximum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment	50 years
Account Standards Update 2017-07 [Member]
Property, Plant and Equipment [Line Items]
Net periodic benefit income	$ 37	$ (1)	$ 151