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Employee Benefits and Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Compensation Related Costs [Abstract]  
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
The following summarizes information related to our pension plans.
Year ended December 31, ($ in millions)
2012
 
2011
Projected benefit obligation
$
355

 
$
528

Fair value of plan assets
214

 
398

Underfunded status
$
(141
)
 
$
(130
)