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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance, Derivatives     $ (2,869) $ (3,785)
Beginning balance, Employee Benefit Plans     (4,456) (4,391)
Beginning balance, Foreign Currency     (377) [1] (364) [1]
Beginning balance     (2,797) (5,437)
Net change, after tax, Securities 4,233 (1,530) 5,139 (606)
Net change, after tax, Derivatives     185 301
Net change, after tax, Employee Benefit Plans     133 1,031
Net change, after tax, Foreign Currency     (91) [1] (1) [1]
Other comprehensive income, net of tax (4,221) 1,496 (4,912) 1,937
Ending balance, Securities (643)   (643)  
Ending balance, Derivatives (2,684) (3,484) (2,684) (3,484)
Ending balance, Employee Benefit Plans (4,323) (3,360) (4,323) (3,360)
Ending balance, Foreign Currency (468) [1] (365) [1] (468) [1] (365) [1]
Ending balance (7,709) (3,500) (7,709) (3,500)
Changes in Accumulated Other Comprehensive Income [Abstract]        
Net change in fair value of accumulated OCI, tax effect, Securities 388      
Net change in fair value recorded in accumulated OCI, before tax, Derivatives     (125) 38
Net change in fair value recorded in accumulated OCI, tax effect, Derivatives     45 (15)
Net change in fair value recorded in accumulated OCI, after tax, Derivatives     (80) 23
Net realized (gains) losses reclassified into earnings, before tax, Derivatives     421 440
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax     (156) (162)
Net realized (gains) losses reclassified into earnings, after tax, Derivatives     265 278
Net change, before tax, Derivatives     296 478
Net change, tax effect, Derivatives     (111) (177)
Net change, after tax, Derivatives     185 301
Net realized (gains) losses reclassified into earnings, before tax, Employee Benefit Plans     146 254
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Realized (Gains) Losses Reclassified into Earnings, Tax     (45) (93)
Net realized (gains) losses reclassified into earnings, after tax, Employee Benefit Plans     101 161
Settlements and curtailments, before tax     42 1,381
Settlements and curtailments, tax effect     (10) (511)
Settlements and curtailments, after tax     32 870
Net change, before tax, Employee Benefit Plans     188 1,635
Net change, tax effect, Employee Benefit Plans     (55) (604)
Net change, after-tax, Employee Benefit Plans     133 1,031
Net change in fair value recorded in accumulated OCI, before tax, Foreign Currency     711 (14)
Net change in fair value recorded in accumulated OCI, tax effect, Foreign Currency     (801) 16
Net change in fair value recorded in accumulated OCI, after tax, Foreign Currency     (90) 2
Net realized (gains) losses reclassified into earnings, before tax, Foreign Currency     32 (3)
Other Comprehensive Income (Loss), Foreign Currency Translation Reclassification Adjustment Realized upon Sale or Liquidation, Tax     (33)   
Net realized (gains) losses reclassified into earnings, after tax, Foreign Currency     (1) (3)
Net change, before tax, Foreign Currency     743 (17)
Net change, tax effect , Foreign Currency     (834) 16
Net change, after tax, Foreign Currency     (91) [1] (1) [1]
Other comprehensive income, before tax     (6,934) 3,004
Other comprehensive income, tax effect     2,022 (1,067)
Other comprehensive income, net of tax (4,221) 1,496 (4,912) 1,937
Available-for-sale Debt Securities [Member]
       
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance, Securities     4,443 3,100
Net change, after tax, Securities     5,088 (593)
Ending balance, Securities (645) 3,693 (645) 3,693
Changes in Accumulated Other Comprehensive Income [Abstract]        
Net change in fair value recorded in accumulated OCI, before tax, Securities     (7,565) 1,995
Net change in fair value of accumulated OCI, tax effect, Securities     2,799 (705)
Net change in fair value recorded in accumulated OCI, after tax, Securities     (4,766) 1,290
Net realized (gains) losses reclassified into earnings, before tax, Securities     (512) (1,107)
Net realized (gains) losses reclassified into earnings, tax effect, Securities     190 410
Net realized (gains) losses reclassified into earnings, after tax, Securities     322 697
Net change, before tax, Securities     (8,077) 888
Net change, tax effect, Securities     2,989 (295)
Net change, after-tax, Securities     (5,088) 593
Available-for-sale Marketable Equity Securities [Member]
       
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance, Securities     462 3
Net change, after tax, Securities     51 (13)
Ending balance, Securities 411 16 411 16
Changes in Accumulated Other Comprehensive Income [Abstract]        
Net change in fair value recorded in accumulated OCI, before tax, Securities     (83) 22
Net change in fair value of accumulated OCI, tax effect, Securities     33 (8)
Net change in fair value recorded in accumulated OCI, after tax, Securities     (50) 14
Net realized (gains) losses reclassified into earnings, before tax, Securities     (1) (2)
Net realized (gains) losses reclassified into earnings, tax effect, Securities     0 1
Net realized (gains) losses reclassified into earnings, after tax, Securities     1 1
Net change, before tax, Securities     (84) 20
Net change, tax effect, Securities     33 (7)
Net change, after-tax, Securities     $ (51) $ 13
[1] 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.