FAIR VALUE (Tables)

3 Months Ended

Mar. 31, 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 March 31, 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)
March 31, 2019
Cash equivalents	$	3,582	$	3,582	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	479		—		479		—
Mortgage-backed securities	3,141		—		3,141		—
Tax-exempt municipal securities	2,103		—		2,103		—
Mortgage-backed securities:
Residential	85		—		85		—
Commercial	509		—		509		—
Asset-backed securities	1,032		—		1,032		—
Corporate debt securities	2,949		—		2,949		—
Total debt securities	10,298		—		10,298		—
Total invested assets	$	13,880	$	3,582	$	10,298	$	—
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	$	—