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Investments - Fair Value of Debt Investments by Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 59	$ 0
Over One Year Through Five Years	120	37
Over Five Years Through Ten Years	3	0
Over Ten Years	12	0
Fair Value	194	37
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
One year or less	4
Over One Year Through Five Years	26
Over Five Years Through Ten Years	3
Over Ten Years	0
Fair Value	33
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
One year or less	42
Over One Year Through Five Years	57
Over Five Years Through Ten Years	0
Over Ten Years	0
Fair Value	99
U.S. government agencies and government- sponsored agencies
Debt Securities, Available-for-sale [Line Items]
One year or less	1
Over One Year Through Five Years	2
Over Five Years Through Ten Years	0
Over Ten Years	4
Fair Value	7
U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
One year or less	12	0
Over One Year Through Five Years	34	37
Over Five Years Through Ten Years	0	0
Over Ten Years	0	0
Fair Value	46	$ 37
Other debt securities
Debt Securities, Available-for-sale [Line Items]
One year or less	0
Over One Year Through Five Years	1
Over Five Years Through Ten Years	0
Over Ten Years	8
Fair Value	$ 9

X

- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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