Investments - (Tables)

6 Months Ended

Jun. 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 June 30, 2020 and December 31, 2019 are presented below.



	June 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	111		3		—		114		123		1		—		124
U.S. government agencies and government- sponsored agencies	24		1		—		25		14		—		—		14
U.S. treasuries	280		5		—		285		163		—		—		163
Certificate of deposit	—		—		—		—		1		—		—		1
Other debt securities	7		—		—		7		10		—		—		10
Total	$	444	$	9	$	—	$	453	$	341	$	1	$	—	$	342

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



	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2020		2019		2020		2019
Gross proceeds from sales	$	12	$	14	$	52	$	28
Gross proceeds from maturities	40		19		67		36
Total	52		33		$	119	$	64

Fair Value of Debt Investments by Contractual Maturity

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



(in millions)	June 30, 2020
One year or less	$	112
Over one year through five years	312
Over five years through ten years	9
Over ten years	20
Total fair value	$	453