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Pension Benefits with a Projected Benefit Obligation, in Excess of Plan Assets (Detail)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Pension Plans With Projected Benefit Obligations In Excess Of Plan Assets Disclosure [Table Text Block]
(Dollars in millions)
 
2011
 
2010
Projected benefit obligation
 

$2,530

 

$105

Accumulated benefit obligation
 
2,530

 
101

  
Pension Plans, Defined Benefit
    
Pension Plans With Projected Benefit Obligations In Excess Of Plan Assets Disclosure [Table Text Block] 2530 105
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] 2530 101