Investments - (Tables)

9 Months Ended

Sep. 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 September 30, 2021 and December 31, 2020 are presented below:

	September 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	$	48	$	—	$	—	$	48	$	24	$	—	$	—	$	24
Corporate bonds	171		1		—		172		126		2		—		128
U.S. government agencies and government- sponsored agencies	18		—		—		18		27		1		—		28
U.S. treasuries	299		2		—		301		261		4		—		265
Certificate of deposit	12		—		—		12		—		—		—		—
Other debt securities	10		—		—		10		6		—		—		6
Total	$	558	$	3	$	—	$	561	$	444	$	7	$	—	$	451

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

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Gross proceeds from sales	$	51	$	18	$	131	$	70
Gross proceeds from maturities	26		29		101		96
Total	$	77	$	47	$	232	$	166

Fair value of debt investments by contractual maturity

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

(in millions)	September 30, 2021
One year or less	$	189
Over one year through five years	335
Over five years through ten years	7
Over ten years	30
Total fair value	$	561