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Schedule of Changes in Level 3 Plan Assets (Detail) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at January 1 $ 924 $ 2,207
Net Realized and Unrealized Gains/ (Losses) 27 52
Net Purchases, Issuances and Settlements (210) (312)
Net Transfers Into/(Out of) Level 3 (6) (919)
Currency Impact (133) (104)
Fair value of plan assets at December 31 602 924
Non-U.S. Equity    
Defined Benefit Plan Disclosure [Line Items]    
Net Transfers Into/(Out of) Level 3 3  
Fair value of plan assets at December 31 3  
Pooled Funds - Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at January 1 26 97
Net Realized and Unrealized Gains/ (Losses) 6 (1)
Net Purchases, Issuances and Settlements 15 25
Net Transfers Into/(Out of) Level 3 (7) (89)
Currency Impact (5) (6)
Fair value of plan assets at December 31 35 26
Corporate Bonds And Other Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at January 1 665 749
Net Realized and Unrealized Gains/ (Losses) 21 4
Net Purchases, Issuances and Settlements (41) (50)
Currency Impact (107) (38)
Fair value of plan assets at December 31 538 665
Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at January 1 230 292
Net Realized and Unrealized Gains/ (Losses)   19
Net Purchases, Issuances and Settlements (184) 61
Net Transfers Into/(Out of) Level 3 (3) (125)
Currency Impact (21) (17)
Fair value of plan assets at December 31 22 230
Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at January 1   829
Net Realized and Unrealized Gains/ (Losses)   13
Net Purchases, Issuances and Settlements   (312)
Net Transfers Into/(Out of) Level 3   (499)
Currency Impact   (31)
Private Equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at January 1 3 240
Net Realized and Unrealized Gains/ (Losses)   17
Net Purchases, Issuances and Settlements   (36)
Net Transfers Into/(Out of) Level 3 1 (206)
Currency Impact   (12)
Fair value of plan assets at December 31 $ 4 $ 3