INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments

The amortized cost, gross unrealized gains, gross unrealized losses, and fair values of our AFS investments as of December 31, 2020 and 2019 are presented below:


	December 31, 2020								December 31, 2019
(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset-backed securities	$	24	$	—	$	—	$	24	$	30	$	—	$	—	$	30
Corporate bonds	126		2		—		128		123		1		—		124
U.S. government agencies and government-sponsored agencies	27		1		—		28		14		—		—		14
U.S. treasuries	261		4		—		265		163		—		—		163

Certificates of deposit	—		—		—		—		1		—		—		1
Other debt securities	6		—		—		6		10		—		—		10
Total	$	444	$	7	$	—	$	451	$	341	$	1	$	—	$	342

Fair Value of Debt Investments by Contractual Maturity

The fair value of debt investments by contractual maturity are shown below:


(in millions)	December 31, 2020
One year or less	$	120
Over one year through five years	301
Over five years through ten years	6
Over ten years	24
Total fair value	$	451

Proceeds from Available-for-sale Securities

The gross proceeds from sales and maturities of AFS securities for the years ended December 31, 2020, 2019, and 2018 are shown below. We had immaterial realized gains and losses from sales of investments for the years ended December 31, 2020, 2019, and 2018.


	Year Ended December 31,
(in millions)	2020		2019		2018


Gross proceeds from sales	$	93	$	76	$	54
Gross proceeds from maturities	131		83		47
Total	$	224	$	159	$	101