Investments - (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities

The amortized cost, gross unrealized gains, gross unrealized losses, and fair values of our AFS investments as of September 30, 2020 and December 31, 2019 are presented below.


	September 30, 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	$	22	$	—	$	—	$	22	$	30	$	—	$	—	$	30
Corporate bonds	118		3		—		121		123		1		—		124
U.S. government agencies and government- sponsored agencies	20		—		—		20		14		—		—		14
U.S. treasuries	285		5		—		290		163		—		—		163

Certificate of deposit	—		—		—		—		1		—		—		1
Other debt securities	7		—		—		7		10		—		—		10
Total	$	452	$	8	$	—	$	460	$	341	$	1	$	—	$	342

The gross proceeds from sales and maturities of AFS securities for the three and nine months ended September 30, 2020 and September 30, 2019 are presented below. We had immaterial gross realized gains and losses from sales of investments for the three and nine months ended September 30, 2020 and 2019.


	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2020		2019		2020		2019


Gross proceeds from sales	$	18	$	24	$	70	$	52
Gross proceeds from maturities	29		25		96		61
Total	47		49		$	166	$	113

Fair Value of Debt Investments by Contractual Maturity

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


(in millions)	September 30, 2020
One year or less	$	98
Over one year through five years	337
Over five years through ten years	4
Over ten years	21
Total fair value	$	460