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Employee Benefit Plans - ABO and PBO in Excess of Plan Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Qualified Pension Plans [Member]
   
Plans with ABO in excess of plan assets    
PBO   $ 7,171
ABO   7,171
Fair value of plan assets   7,114
Plans with PBO in excess of plan assets    
PBO   7,171
Fair value of plan assets   7,114
Non-U.S. Pension Plans [Member]
   
Plans with ABO in excess of plan assets    
PBO 617 883
ABO 606 843
Fair value of plan assets 290 510
Plans with PBO in excess of plan assets    
PBO 720 896
Fair value of plan assets 392 522
Nonqualified and Other Pension Plans [Member]
   
Plans with ABO in excess of plan assets    
PBO 1,129 1,182
ABO 1,126 1,181
Fair value of plan assets 2 2
Plans with PBO in excess of plan assets    
PBO 1,129 1,182
Fair value of plan assets $ 2 $ 2