v3.3.1.900
Pension Benefits Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,209 $ 1,264  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 31 29  
Time Deposits      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 9 8  
Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 457 461  
Bond Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 230 265  
Real Estate Trust Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 39 41  
Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 102 102  
Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1 1  
Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 286 307  
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 54 50  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 367 370  
Level 1 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 31 29  
Level 1 | Time Deposits      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 1 | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 1 | Bond Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 1 | Real Estate Trust Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 1 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 1 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 1 | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 282 291  
Level 1 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 54 50  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 700 750  
Level 2 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 2 | Time Deposits      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 9 8  
Level 2 | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 457 461  
Level 2 | Bond Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 230 265  
Level 2 | Real Estate Trust Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 2 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 2 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 2 | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 4 16  
Level 2 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 142 144  
Level 3 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 3 | Time Deposits      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 3 | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 3 | Bond Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 3 | Real Estate Trust Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 39 41 $ 45
Level 3 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 102 102 90
Level 3 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1 1 $ 4
Level 3 | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Level 3 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0