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Restricted Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of restricted investments by health plan
The following table presents the balances of restricted investments:
 
December 31,
 
2016
 
2015
 
(In millions)
Florida
$
22

 
$
34

Illinois
3

 
—

Michigan
1

 
1

New Mexico
43

 
43

New York
9

 
—

Ohio
12

 
12

Puerto Rico
10

 
10

Texas
4

 
4

Utah
4

 
4

Wisconsin
1

 
1

Other
1

 
—

Total Health Plans segment
$
110

 
$
109
Contractual maturities of our held-to-maturity restricted investments
The contractual maturities of our restricted investments, which are designated as held-to-maturity and are carried at amortized cost, which approximates fair value, as of December 31, 2016 are summarized below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(In millions)
Due in one year or less
$
100

 
$
100

Due after one year through five years
10

 
10

 
$
110

 
$
110