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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, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period $ 1,666  
Fair value at end of period 1,533 $ 1,666
United States Pension Plan of US Entity [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period 1,622 1,649
Fair value at end of period 1,493 1,622
Foreign Pension Plan [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period 44 42
Fair value at end of period 40 44
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period 137  
Fair value at end of period 116 137
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member] | Hedge Funds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period $ 87 $ 83
Unrealized gains (losses) relating to: Assets sold during the period
Unrealized gains (losses) relating to: Assets still held at the reporting date $ 2 $ 4
Purchases, sales and settlements
Transfers into (out of) Level 3 $ (14)  
Fair value at end of period 75 $ 87
Fair Value, Inputs, Level 3 [Member] | United States Pension Plan of US Entity [Member] | Real Estate and Other Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period $ 50 $ 48
Unrealized gains (losses) relating to: Assets sold during the period
Unrealized gains (losses) relating to: Assets still held at the reporting date $ 4 $ 5
Purchases, sales and settlements 2 (3)
Transfers into (out of) Level 3 (15)  
Fair value at end of period 41 50
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period 10  
Fair value at end of period 12 10
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member] | Insurance Contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value at beginning of period $ 10 $ 11
Unrealized gains (losses) relating to: Assets sold during the period
Unrealized gains (losses) relating to: Assets still held at the reporting date
Purchases, sales and settlements $ (1)
Currency impact $ (1)  
Transfers into (out of) Level 3 3  
Fair value at end of period $ 12 $ 10