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Goodwill and Other Intangible Assets and Liablities Goodwill (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill [Line Items]  
Business Combination, Segment Allocation [Table Text Block]
The changes in the carrying amount of goodwill were as follows (in millions):

 
 
December 31,
2015
 
December 31,
2014
Beginning balance
 
$
14,819

 
$
14,819

Additions
 
26

 
—

Ending balance
 
$
14,845

 
$
14,819