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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in goodwill
Changes in goodwill during the years ended December 31, 2017 and 2016 are summarized as follows (in millions):
 
IFS
 
GFS
 
Corporate & Other
 
Total
Balance, December 31, 2015
$
7,676

 
$
6,605

 
$
464

 
$
14,745

Purchase price and foreign currency adjustments
—

 
(273
)
 
65

 
(208
)
Goodwill relating to PS&E included in assets held for sale
—

 
—

 
(359
)
 
(359
)
Balance, December 31, 2016
7,676

 
6,332

 
170

 
14,178

Purchase price and foreign currency adjustments
—

 
39

 
—

 
39

Goodwill distributed through sale of businesses
(14
)
 
(473
)
 
—

 
(487
)
Balance, December 31, 2017
$
7,662

 
$
5,898

 
$
170

 
$
13,730