v3.3.1.900
Pension And Other Postretirement Benefits (Change In Plan Assets Of Pension And Other Postretirement Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits - U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 $ 12,915 $ 11,190
Actual return on plan assets (307) 1,497
Company contribution   1,476
Fair value at December 31 10,985 12,915
Pension Benefits - Non-U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 20,095 19,283
Actual return on plan assets 918 3,153
Foreign exchange rate changes (2,109) (1,738)
Company contribution 515 554
Other (112) (245)
Fair value at December 31 18,417 20,095
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 468 620
Actual return on plan assets   41
Company contribution 42 31
Fair value at December 31 414 468
Benefit Payments For Funded Plans [Member] | Pension Benefits - U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Benefits paid [1] (1,623) (1,248)
Benefit Payments For Funded Plans [Member] | Pension Benefits - Non-U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Benefits paid [1] (890) (912)
Benefit Payments For Funded Plans [Member] | Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Benefits paid [1] $ (96) $ (224)
[1] Benefit payments for funded plans.