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Restructuring (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2017 by segment is as follows:
 
2017 Restructuring Plan
 
2016 Restructuring Plan
(in millions)
Initial Charge Recorded
 
Ending Reserve Balance
 
Initial Charge Recorded
 
Ending Reserve Balance
Ratings
$
25

 
$
24

 
$
14

 
4

Market and Commodities Intelligence
9

 
5

 
10

 
3

Indices
—

 
—

 
1

 
—

Corporate
10

 
10

 
5

 
1

Total
$
44

 
$
39

 
$
30

 
$
8