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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Investments
Investments
($ in millions)
2016
 
2015
Investments in equity affiliates
$
46

 
$
221

Marketable equity securities - Trading (See Note 9)
78

 
77

Other
55

 
69

Total
$
179

 
$
367