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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2011
Accumulated Other Comprehensive Income Loss Tax [Abstract]  
Comprehensive Income
 
Pre-tax Amount
 
Income Tax (Expense) Benefit
 
After-tax Amount
(Dollars in millions)
 
 
AOCI, January 1, 2009

$1,523

 

($542
)
 

$981

Unrealized net gain on securities
529

 
(188
)
 
341

Unrealized net loss on derivatives
(190
)
 
59

 
(131
)
Change related to employee benefit plans
394

 
(143
)
 
251

Adoption of OTTI guidance
(12
)
 
4

 
(8
)
Reclassification adjustment for realized gains and losses on securities
(98
)
 
38

 
(60
)
Reclassification adjustment for realized gains and losses on derivatives
(485
)
 
181

 
(304
)
AOCI, December 31, 2009
1,661

 
(591
)
 
1,070

Unrealized net gain on securities
770

 
(283
)
 
487

Unrealized net gain on derivatives
802

 
(293
)
 
509

Change related to employee benefit plans
106

 
(46
)
 
60

Reclassification adjustment for realized gains and losses on securities
(191
)
 
70

 
(121
)
Reclassification adjustment for realized gains and losses on derivatives
(617
)
 
228

 
(389
)
AOCI, December 31, 2010
2,531

 
(915
)
 
1,616

Unrealized net gain on securities
653

 
(242
)
 
411

Unrealized net gain on derivatives
684

 
(253
)
 
431

Change related to employee benefit plans
(382
)
 
141

 
(241
)
Reclassification adjustment for realized gains and losses on securities
(117
)
 
43

 
(74
)
Reclassification adjustment for realized gains and losses on derivatives
(625
)
 
231

 
(394
)
AOCI, December 31, 2011

$2,744

 

($995
)
 

$1,749
Components of Accumulated Other Comprehensive Income
(Dollars in millions)
2011
 
2010
 
2009
Unrealized net gain on AFS securities

$1,863

 

$1,526

 

$1,160

Unrealized net gain on derivative financial instruments
569

 
532

 
412

Employee benefit plans
(683
)
 
(442
)
 
(502
)
Total AOCI

$1,749

 

$1,616

 

$1,070