Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) (Details)

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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     $ (8,457) $ (2,797)
Other Comprehensive Income (Loss), Net of Tax 2,326 (4,221) 3,746 (4,912)
Ending balance (4,711) (7,709) (4,711) (7,709)
Available-for-sale Securities, Tax        
Net change in fair value, Tax     (200)  
Available-for-sale Securities, after Tax        
Net changer, after Tax     3,594 (5,139)
Derivatives, before Tax        
Net change in fair value, before Tax     (19) (125)
Net realized losses reclassified into earnings, before Tax     335 421
Net change, before Tax     316 296
Derivatives, Tax        
Net change in fair value, Tax     25 45
Net realized losses reclassified into earnings, Tax     (126) (156)
Net change, Tax     (101) (111)
Derivatives, after Tax        
Net change in fair value, after Tax     6 (80)
Net realized losses reclassified into earnings, after Tax     209 265
Net change, after Tax     215 185
Employee benefit plans, before Tax        
Net realized losses reclassified into earnings, before Tax     25 146
Settlements and curtailments, before Tax     0 42
Net change, before Tax     25 188
Employee benefit plans, Tax        
Net realized losses reclassified into earnings, Tax     (10) (45)
Settlements and curtailments, Tax     41 (10)
Net change, Tax     31 (55)
Employee benefit plans, after Tax        
Net realized losses reclassified into earnings, after Tax     15 101
Settlements and curtailments, after Tax     41 32
Net change, after Tax     56 133
Foreign currency, before Tax        
Net change in fair value, before Tax     (368) 711
Net realized (gains) losses reclassified into earnings, before Tax     (2) 32
Net change, before Tax     (370) 743
Foreign currency, Tax        
Net change in fair value, Tax     250 (801)
Net realized losses reclassified into earnings, Tax     1 (33)
Net change, Tax     251 (834)
Foreign currency, after Tax        
Net change in fair value, after Tax     (118) (90)
Net realized losses reclassified into earnings, after Tax     (1) (1)
Net change, after Tax 7 (49) (119) (91)
Other comprehensive income (loss), net-of-tax:        
Other Comprehensive Income (Loss), before Tax     5,691 (6,934)
Other Comprehensive Income (Loss), Tax     (1,945) 2,022
Other Comprehensive Income (Loss), Net of Tax     3,746 (4,912)
Debt [Member]
        
Available-for-sale Securities, before Tax        
Net change in fair value, before Tax     6,497 (7,565)
Net realized gains reclassified into earnings, before Tax     (748) (512)
Net change, before Tax     5,749 (8,077)
Available-for-sale Securities, Tax        
Net change in fair value, Tax     (2,421) 2,799
Net realized gains reclassified into earnings, Tax     284 190
Net change, Tax     (2,137) 2,989
Available-for-sale Securities, after Tax        
Net change in fair value, after Tax     4,076 (4,766)
Net realized gains reclassified into earnings, after Tax     (464) (322)
Net changer, after Tax     3,612 (5,088)
Equity [Member]
        
Available-for-sale Securities, before Tax        
Net change in fair value, before Tax     (29) (83)
Net realized gains reclassified into earnings, before Tax     0 (1)
Net change, before Tax     (29) (84)
Available-for-sale Securities, Tax        
Net change in fair value, Tax     11 33
Net realized gains reclassified into earnings, Tax     0 0
Net change, Tax     11 33
Available-for-sale Securities, after Tax        
Net change in fair value, after Tax     (18) (50)
Net realized gains reclassified into earnings, after Tax     0 (1)
Net changer, after Tax     (18) (51)
Available-for-sale debt securities [Member] | Debt [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (3,257) 4,443
Other Comprehensive Income (Loss), Net of Tax     3,612 (5,088)
Ending balance 355 (645) 355 (645)
Available-for-sale debt securities [Member] | Equity [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (4) 462
Other Comprehensive Income (Loss), Net of Tax     (18) (51)
Ending balance (22) 411 (22) 411
Derivatives [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (2,277) (2,869)
Other Comprehensive Income (Loss), Net of Tax     215 185
Ending balance (2,062) (2,684) (2,062) (2,684)
Employee benefit plans [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (2,407) (4,456)
Other Comprehensive Income (Loss), Net of Tax     56 133
Ending balance (2,351) (4,323) (2,351) (4,323)
Foreign currency [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     (512) [1] (377) [1]
Other Comprehensive Income (Loss), Net of Tax     (119) [1] (91) [1]
Ending balance $ (631) [1] $ (468) [1] $ (631) [1] $ (468) [1]
[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.