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Postretirement Benefit Plans (Summary of Plan Assets, Benefit Obligation and Funded Status) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 562 $ 559  
Projected benefit obligation (918) (840)  
Unfunded status of the plans (356) (281)  
Amounts recognized in the balance sheet      
Other non-current assets 67 68  
Accrued and other current liabilities (15) (14)  
Accrued postretirement benefits (408) (335)  
Net amount recognized (356) (281)  
Accumulated other comprehensive income:      
Net actuarial losses (252) (265)  
Prior service credit 13 15  
Total (239) (250)  
Pension      
Defined Benefit Plan Disclosure      
Fair value of plan assets 562 559  
Projected benefit obligation (854) (779)  
Unfunded status of the plans (292) (220)  
Amounts recognized in the balance sheet      
Other non-current assets 67 68  
Accrued and other current liabilities (11) (10)  
Accrued postretirement benefits (348) (278)  
Net amount recognized (292) (220)  
Accumulated other comprehensive income:      
Net actuarial losses (220) (234)  
Prior service credit 1 0  
Total (219) (234)  
Other Benefits      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Projected benefit obligation (64) (61) $ (58)
Unfunded status of the plans (64) (61)  
Amounts recognized in the balance sheet      
Other non-current assets 0 0  
Accrued and other current liabilities (4) (4)  
Accrued postretirement benefits (60) (57)  
Net amount recognized (64) (61)  
Accumulated other comprehensive income:      
Net actuarial losses (32) (31)  
Prior service credit 12 15  
Total (20) (16)  
Global stock funds/securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 6 4  
Index funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 36 34  
Corporate bonds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 18 11  
Government bonds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 11 10  
Hedge funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 178 181  
Private Equity Funds [Member]      
Defined Benefit Plan Disclosure      
Fair value of plan assets 13 17  
Plan Assets Measured at Net Asset Value [Member]      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 262 $ 257