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Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Securities
Amortized Cost	$ 428	$ 341
Gross Unrealized Gains	7	1
Gross Unrealized Losses	(1)	0
Fair Value	434	342
Asset-backed securities
Debt Securities
Amortized Cost	30	30
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	30	30
Corporate bonds
Debt Securities
Amortized Cost	126	123
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(1)	0
Fair Value	126	124
U.S. government agencies and government- sponsored agencies
Debt Securities
Amortized Cost	24	14
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	25	14
U.S. treasuries
Debt Securities
Amortized Cost	239	163
Gross Unrealized Gains	5	0
Gross Unrealized Losses	0	0
Fair Value	244	163
Certificate of deposits
Debt Securities
Amortized Cost	1	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1	1
Other debt securities
Debt Securities
Amortized Cost	8	10
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 8	$ 10

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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