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Restructuring (Tables)
 9 Months Ended
Sep. 30, 2017
Restructuring and Related Activities [Abstract]  
Schedule of initial restructuring charge recorded and the ending reserve balance
The initial restructuring charge recorded and the ending reserve balance as of September 30, 2017 by segment is as follows:
 
2017 Restructuring Plans
 
2016 Restructuring Plans
(in millions)
Initial Charge Recorded
 
Ending Reserve Balance
 
Initial Charge Recorded
 
Ending Reserve Balance
Ratings
$
15

 
$
15

 
$
14

 
$
4

Market and Commodities Intelligence
5

 
4

 
10

 
5

Indices
—

 
—

 
1

 
—

Corporate
4

 
4

 
5

 
3

Total
$
24

 
$
23

 
$
30

 
$
12