Investments - (Tables)

3 Months Ended

Mar. 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 March 31, 2020 and December 31, 2019 are presented below.

	March 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	$	30	$	—	$	—		$	30	$	30	$	—	$	—	$	30
Corporate bonds	126		1		(1		)	126		123		1		—		124
U.S. government agencies and government- sponsored agencies	24		1		—			25		14		—		—		14
U.S. treasuries	239		5		—			244		163		—		—		163
Certificate of deposit	1		—		—			1		1		—		—		1
Other debt securities	8		—		—			8		10		—		—		10
Total	$	428	$	7	$	(1	)	$	434	$	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)	March 31, 2020
One year or less	$	94
Over one year through five years	310
Over five years through ten years	9
Over ten years	21
Total fair value	$	434

Proceeds from available-for-sale securities

The gross proceeds from sales and maturities of AFS securities for the three months ended March 31, 2020 and March 31, 2019 are presented below. We had immaterial gross realized gains and losses from sales of investments for the three months ended March 31, 2020 and March 31, 2019.

	Three Months Ended March 31,
(in millions)	2020		2019
Gross proceeds from sales	$	40	$	14
Gross proceeds from maturities	27		17
Total	$	67	$	31