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
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ (8,457) $ (2,797)
Other Comprehensive Income (Loss), Net of Tax 1,420 (691)
Ending balance (7,037) (3,488)
Available-for-sale Securities, Tax    
Net change in fair value, Tax 1,200  
Available-for-sale Securities, after Tax    
Net changer, after Tax 1,289 (906)
Derivatives, before Tax    
Net change in fair value, before Tax 173 41
Net realized losses reclassified into earnings, before Tax 131 235
Net change, before Tax 304 276
Derivatives, Tax    
Net change in fair value, Tax (47) (17)
Net realized losses reclassified into earnings, Tax (49) (87)
Net change, Tax (96) (104)
Derivatives, after Tax    
Net change in fair value, after Tax 126 24
Net realized losses reclassified into earnings, after Tax 82 148
Net change, after Tax 208 172
Employee benefit plans, before Tax    
Net realized losses reclassified into earnings, before Tax 13 74
Settlements and curtailments, before Tax 0 42
Net change, before Tax 13 116
Employee benefit plans, Tax    
Net realized losses reclassified into earnings, Tax (5) (21)
Settlements and curtailments, Tax 41 (10)
Net change, Tax 36 (31)
Employee benefit plans, after Tax    
Net realized losses reclassified into earnings, after Tax 8 53
Settlements and curtailments, after Tax 41 32
Net change, after Tax 49 85
Foreign currency, before Tax    
Net change in fair value, before Tax (96) 528
Net realized (gains) losses reclassified into earnings, before Tax (2) 34
Net change, before Tax (98) 562
Foreign currency, Tax    
Net change in fair value, Tax (29) (569)
Net realized losses reclassified into earnings, Tax 1 (35)
Net change, Tax (28) (604)
Foreign currency, after Tax    
Net change in fair value, after Tax (125) (41)
Net realized losses reclassified into earnings, after Tax (1) (1)
Net change, after Tax (126) (42)
Other comprehensive income (loss), net-of-tax:    
Other Comprehensive Income (Loss), before Tax 2,219 (486)
Other Comprehensive Income (Loss), Tax (799) (205)
Other Comprehensive Income (Loss), Net of Tax 1,420 (691)
Debt [Member]
    
Available-for-sale Securities, before Tax    
Net change in fair value, before Tax 2,389 (1,444)
Net realized gains reclassified into earnings, before Tax (376) (59)
Net change, before Tax 2,013 (1,503)
Available-for-sale Securities, Tax    
Net change in fair value, Tax (859) 535
Net realized gains reclassified into earnings, Tax 143 22
Net change, Tax (716) 557
Available-for-sale Securities, after Tax    
Net change in fair value, after Tax 1,530 (909)
Net realized gains reclassified into earnings, after Tax (233) (37)
Net changer, after Tax 1,297 (946)
Equity [Member]
    
Available-for-sale Securities, before Tax    
Net change in fair value, before Tax (13) 64
Net realized gains reclassified into earnings, before Tax 0 (1)
Net change, before Tax (13) 63
Available-for-sale Securities, Tax    
Net change in fair value, Tax 5 (24)
Net realized gains reclassified into earnings, Tax 0 1
Net change, Tax 5 (23)
Available-for-sale Securities, after Tax    
Net change in fair value, after Tax (8) 40
Net realized gains reclassified into earnings, after Tax 0 0
Net changer, after Tax (8) 40
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 1,297 (946)
Ending balance (1,960) 3,497
Other comprehensive income (loss), net-of-tax:    
Other Comprehensive Income (Loss), Net of Tax 1,297 (946)
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 (8) 40
Ending balance (12) 502
Other comprehensive income (loss), net-of-tax:    
Other Comprehensive Income (Loss), Net of Tax (8) 40
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 208 172
Ending balance (2,069) (2,697)
Other comprehensive income (loss), net-of-tax:    
Other Comprehensive Income (Loss), Net of Tax 208 172
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 49 85
Ending balance (2,358) (4,371)
Other comprehensive income (loss), net-of-tax:    
Other Comprehensive Income (Loss), Net of Tax 49 85
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 (126) [1] (42) [1]
Ending balance (638) [1] (419) [1]
Other comprehensive income (loss), net-of-tax:    
Other Comprehensive Income (Loss), Net of Tax $ (126) [1] $ (42) [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.