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Accumulated Other Comprehensive Income
 9 Months Ended
Sep. 30, 2012
Accumulated Other Comprehensive Income

18. Accumulated Other Comprehensive Income

The activity of the components of other comprehensive income and accumulated other comprehensive income for the nine months ended September 30, 2012 and 2011 was as follows:
               
   Total Other Total Accumulated Other 
   Comprehensive Income Comprehensive Income 
   PretaxTaxNetBeginningNetEnding
($ in millions) ActivityEffectActivityBalanceActivityBalance
2012             
Unrealized holding gains on available-for-sale securities arising              
 during period$29 (10) 19       
Reclassification adjustment for net gains included in net income (16) 6 (10)       
Net unrealized gains on available-for-sale securities 13 (4) 9 485 9 494 
               
Unrealized holding gains on cash flow hedge derivatives arising             
 during period 35 (12) 23       
Reclassification adjustment for net gains on cash flow             
 hedge derivatives included in net income (63) 22 (41)       
Net unrealized gains on cash flow hedge derivatives (28) 10 (18) 80 (18) 62 
               
Defined benefit plans:             
 Net actuarial loss 11 (4) 7       
Defined benefit plans, net 11 (4) 7 (95) 7 (88) 
Total$(4) 2 (2) 470 (2) 468 

               
   Total Other Total Accumulated Other 
   Comprehensive Income Comprehensive Income 
   PretaxTaxNetBeginningNetEnding
($ in millions) ActivityEffectActivityBalanceActivityBalance
2011             
Unrealized holding gains on available-for-sale securities arising              
 during period$369 (126) 243       
Reclassification adjustment for net gains included in net income (64) 19 (45)       
Net unrealized gains on available-for-sale securities 305 (107) 198 321 198 519 
               
Unrealized holding gains on cash flow hedge derivatives arising             
 during period 59 (20) 39       
Reclassification adjustment for net gains on cash flow             
 hedge derivatives included in net income (21) 7 (14)       
Net unrealized gains on cash flow hedge derivatives 38 (13) 25 67 25 92 
               
Defined benefit plans:             
 Net actuarial loss 8 (3) 5       
Defined benefit plans, net 8 (3) 5 (74) 5 (69) 
Total$351 (123) 228 314 228 542