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FAIR VALUE (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Financial Assets Measured at Fair Value on Recurring Basis
The following table summarizes our fair value measurements at June 30, 2018 and December 31, 2017, respectively, for financial assets measured at fair value on a recurring basis:
 
Fair Value Measurements Using
 
Fair
Value
 
Quoted Prices
in Active
Markets
(Level 1)
 
Other
Observable
Inputs
(Level 2)
 
Unobservable
Inputs
(Level 3)
 
(in millions)
June 30, 2018
 
 
 
 
 
 
 
Cash equivalents
$
6,279

 
$
6,279

 
$
—

 
$
—

Debt securities:
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
627

 
—

 
627

 
—

Mortgage-backed securities
2,258

 
—

 
2,258

 
—

Tax-exempt municipal securities
2,999

 
—

 
2,999

 
—

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
17

 
—

 
17

 
—

Commercial
517

 
—

 
517

 
—

Asset-backed securities
573

 
—

 
573

 
—

Corporate debt securities
2,852

 
—

 
2,852

 
—

Total debt securities
9,843

 
—

 
9,843

 
—

Total invested assets
$
16,122

 
$
6,279

 
$
9,843

 
$
—

 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
Cash equivalents
$
4,564

 
$
4,564

 
$
—

 
$
—

Debt securities:
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
531

 
—

 
531

 
—

Mortgage-backed securities
1,610

 
—

 
1,610

 
—

Tax-exempt municipal securities
3,889

 
—

 
3,889

 
—

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
26

 
—

 
26

 
—

Commercial
456

 
—

 
456

 
—

Asset-backed securities
408

 
—

 
408

 
—

Corporate debt securities
5,382

 
—

 
5,381

 
1

Total debt securities
12,302

 
—

 
12,301

 
1

Total invested assets
$
16,866

 
$
4,564

 
$
12,301

 
$
1