Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Value of Plan Assets (Details)

v2.4.0.6
Employee Benefit Plans - Fair Value of Plan Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 5,064 $ 4,827    
Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 909 800    
Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 3,841 3,769    
Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 314 258 254 266
U.S. Government and government agency obligations | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 13 13 14 0
Cash and short-term investments | Money market and interest bearing cash
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 482 190    
Cash and short-term investments | Money market and interest bearing cash | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 482 190    
Cash and short-term investments | Money market and interest bearing cash | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Cash and short-term investments | Money market and interest bearing cash | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income | U.S. Government and government agency obligations
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,195 2,530    
Fixed Income | U.S. Government and government agency obligations | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 164 432    
Fixed Income | U.S. Government and government agency obligations | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,018 2,085    
Fixed Income | U.S. Government and government agency obligations | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 13 13    
Fixed Income | Corporate debt securities
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 136 132    
Fixed Income | Corporate debt securities | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income | Corporate debt securities | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 136 132    
Fixed Income | Corporate debt securities | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income | Asset-backed securities
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 667 399    
Fixed Income | Asset-backed securities | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income | Asset-backed securities | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 667 399    
Fixed Income | Asset-backed securities | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income | Non-U.S. debt securities
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 246 173    
Fixed Income | Non-U.S. debt securities | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 32 20    
Fixed Income | Non-U.S. debt securities | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 214 153    
Fixed Income | Non-U.S. debt securities | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Fixed Income | Mutual funds
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 170 150    
Fixed Income | Mutual funds | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 52 46    
Fixed Income | Mutual funds | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 118 104    
Fixed Income | Mutual funds | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity securities | Mutual funds
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 232 355    
Equity securities | Mutual funds | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 31 28    
Equity securities | Mutual funds | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 201 327    
Equity securities | Mutual funds | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity securities | Common and preferred equity securities
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 147 84    
Equity securities | Common and preferred equity securities | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 147 84    
Equity securities | Common and preferred equity securities | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Equity securities | Common and preferred equity securities | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Real estate | Mutual funds
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 136 80    
Real estate | Mutual funds | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Real estate | Mutual funds | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 10 11    
Real estate | Mutual funds | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 126 69 65 45
Limited partnerships
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 180 181    
Limited partnerships | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Limited partnerships | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 5 5    
Limited partnerships | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 175 176 175 111
Other investments
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 473 [1] 553 [2]    
Other investments | Level 1
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1 [1] 0 [2]    
Swaps included in other investments 311 465    
Commodity and balance funds included in other investments 158 88    
Other Various Investments 4      
Other investments | Level 2
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 472 [1] 553 [2]    
Other investments | Level 3
        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 0 [1] $ 0 [2] $ 0 $ 110
[1] Other investments includes swaps of $311 million, commodity and balanced funds of $158 million, and various other investments of $4 million.
[2] Other investments includes swaps of $465 million and commodity and balanced funds of