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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

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