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FAIR VALUE (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets Measured at Fair Value on Recurring Basis
The following table summarizes our fair value measurements at June 30, 2019 and December 31, 2018, 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, 2019
 
 
 
 
 
 
 
Cash equivalents
$
4,553

 
$
4,553

 
$
—

 
$
—

Debt securities:
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
372

 
—

 
372

 
—

Mortgage-backed securities
3,520

 
—

 
3,520

 
—

Tax-exempt municipal securities
1,659

 
—

 
1,659

 
—

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
1

 
—

 
1

 
—

Commercial
638

 
—

 
638

 
—

Asset-backed securities
1,036

 
—

 
1,036

 
—

Corporate debt securities
3,176

 
—

 
3,176

 
—

Total debt securities
10,402

 
—

 
10,402

 
—

Total invested assets
$
14,955

 
$
4,553

 
$
10,402

 
$
—

 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
 
 
 
 
Cash equivalents
$
2,024

 
$
2,024

 
$
—

 
$
—

Debt securities:
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
417

 
—

 
417

 
—

Mortgage-backed securities
2,544

 
—

 
2,544

 
—

Tax-exempt municipal securities
2,771

 
—

 
2,771

 
—

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
55

 
—

 
55

 
—

Commercial
523

 
—

 
523

 
—

Asset-backed securities
985

 
—

 
985

 
—

Corporate debt securities
3,142

 
—

 
3,142

 
—

Total debt securities
10,437

 
—

 
10,437

 
—

Total invested assets
$
12,461

 
$
2,024

 
$
10,437

 
$
—