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Pensions Benefit Plans and Other Postretirement Benefits - U.S. Plan Assets By Hierarchy (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value $ 1,394 $ 1,654 $ 1,909
Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value 975 1,011 1,012
Investments measured at net asset value 906 901  
Total non-U.S. assets at fair value 975 1,011  
Cash and cash equivalents | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value $ 9 24  
Equity securities | U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 65.00%    
Equity securities | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 22.00%    
Debt securities | U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 28.00%    
Debt securities | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 54.00%    
Plan assets at fair value $ 33 39  
Real estate | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value   4  
Other | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value $ 27 43  
Real estate and other | U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 7.00%    
Real estate and other | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Percentage of pension plan assets 24.00%    
Level 1 | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value $ 42 61  
Level 1 | Cash and cash equivalents | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value 9 24  
Level 1 | Debt securities | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value 33 37  
Level 2 | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value 27 39  
Level 2 | Debt securities | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value   2  
Level 2 | Other | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value $ 27 37  
Level 3 | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value   10 $ 11
Level 3 | Real estate | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value   4  
Level 3 | Other | Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure      
Plan assets at fair value   $ 6