Investments - (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021 and December 31, 2020 are presented below:


	June 30, 2021								December 31, 2020
(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	$	44	$	—	$	—	$	44	$	24	$	—	$	—	$	24
Corporate bonds	167		2		—		169		126		2		—		128
U.S. government agencies and government- sponsored agencies	19		—		—		19		27		1		—		28
U.S. treasuries	312		3		—		315		261		4		—		265

Certificate of deposit	10		—		—		10		—		—		—		—
Other debt securities	8		—		—		8		6		—		—		6
Total	$	560	$	5	$	—	$	565	$	444	$	7	$	—	$	451

The gross proceeds from sales and maturities of AFS securities for the three and six months ended June 30, 2021 and June 30, 2020 are presented below. We had immaterial gross realized gains and losses from sales of investments for the three and six months ended June 30, 2021 and 2020.


	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2021		2020		2021		2020


Gross proceeds from sales	$	39	$	12	$	80	$	52
Gross proceeds from maturities	32		40		75		67
Total	$	71	$	52	$	155	$	119

Fair Value of Debt Investments by Contractual Maturity

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


(in millions)	June 30, 2021
One year or less	$	188
Over one year through five years	340
Over five years through ten years	7
Over ten years	30
Total fair value	$	565