Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details)

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Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     $ (8,457) $ (2,797)
Net change (804) 886 2,942 (4,026)
Ending balance (5,515) (6,823) (5,515) (6,823)
Derivatives
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (2,277) (2,869)
Net change     411 365
Ending balance (1,866) (2,504) (1,866) (2,504)
Employee Benefit Plans
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (2,407) (4,456)
Net change     64 1,513
Ending balance (2,343) (2,943) (2,343) (2,943)
Foreign currency
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (512) [1] (377) [1]
Net change     (133) [1] (134) [1]
Ending balance (645) [1] (511) [1] (645) [1] (511) [1]
Debt securities | Available-for-sale debt securities
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (3,257) 4,443
Net change     2,601 (5,303)
Ending balance (656) (860) (656) (860)
Equity securities | Available-for-sale debt securities
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (4) 462
Net change     (1) (467)
Ending balance $ (5) $ (5) $ (5) $ (5)
[1] The net change in fair value represents the impact of changes in spot foreign exchange rates on the Corporation's net investment in non-U.S. operations and related hedges.