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Pension and Postretirement Benefit Plans - Reconciliation of Level 3 Pension Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Fair value at beginning of period $ 1,505  
Actual gains relating to assets still held at the reporting date 3  
Fair value at end of period 1,584 $ 1,505
Pension Plan [Member] | Foreign Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at beginning of period 51 40
Fair value at end of period 71 51
Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at beginning of period 16  
Fair value at end of period 33 16
Pension Plan [Member] | Foreign Plan [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at beginning of period 16 12
Purchases, sales and settlements 1
Currency impact 3
Transfers into (out of) Level 3 10 4
Fair value at end of period $ 33 $ 16