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Accumulated Other Comprehensive Income/(Loss) - Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     $ 2,189    
Net change, unrealized gains/(losses) on AFS securities $ (1,419) $ 1,075 (1,330) $ 2,069  
Net change, translation adjustments, net of hedges 3 12 (7) 10  
Net change, cash flow hedges 80 68 157 127  
Net change, defined benefit pension and OPEB plans 8 7 93 33  
Net change, accumulated other comprehensive income/(loss) (1,328) 1,162 (1,087) 2,239  
Ending Balance 1,102   1,102    
Accumulated other comprehensive income (loss) - supplemental information          
Net pre-tax unrealized gains (losses) in AOCI on securities on the date of transfer         $ (9)
Unrealized gains/(losses) on investment securities          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance 4,862 3,792 4,773 2,798  
Net change, unrealized gains/(losses) on AFS securities (1,419) 1,075 (1,330) 2,069  
Ending Balance 3,443 4,867 3,443 4,867  
Translation adjustments, net of hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (157) (138) (147) (136)  
Net change, translation adjustments, net of hedges 3 12 (7) 10  
Ending Balance (154) (126) (154) (126)  
Cash flow hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (18) (80) (95) (139)  
Net change, cash flow hedges 80 68 157 127  
Ending Balance 62 (12) 62 (12)  
Defined benefit pension and OPEB plans          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (2,257) (1,298) (2,342) (1,324)  
Net change, defined benefit pension and OPEB plans 8 7 93 33  
Ending Balance (2,249) (1,291) (2,249) (1,291)  
Accumulated other comprehensive income/(loss)          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance 2,430 2,276 2,189 1,199  
Net change, accumulated other comprehensive income/(loss) (1,328) 1,162 (1,087) 2,239  
Ending Balance $ 1,102 $ 3,438 $ 1,102 $ 3,438