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Short-term and Long-term Investments, Restricted Deposits - Schedule by investment Type (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	$ 8,208	$ 5,982
Gross Unrealized Gains	21	27
Gross Unrealized Losses	(91)	(31)
Fair Value	8,138		$ 5,978
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	362	311
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(2)	(2)
Fair Value	361	309
Corporate securities
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	3,190	2,208
Gross Unrealized Gains	8	12
Gross Unrealized Losses	(52)	(10)
Fair Value	3,146	2,210
Restricted certificates of deposit
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	433	4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	433	4
Restricted cash equivalents
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	8	17
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	8	17
Municipal securities
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	2,196	2,085
Gross Unrealized Gains	9	12
Gross Unrealized Losses	(18)	(10)
Fair Value	2,187	2,087
Asset-backed securities
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	686	437
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(4)	(1)
Fair Value	683	437
Residential mortgage-backed securities
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	452	337
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(9)	(6)
Fair Value	444	332
Commercial mortgage- backed securities
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	366	272
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(6)	(2)
Fair Value	361	271
Private equity investments
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	387	176
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	387	176
Life insurance contracts
Schedule Of Investments And Restricted Deposits By Type [Line Items]
Amortized Cost	128	135
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 128	$ 135

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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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