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Short-term and Long-term Investments, Restricted Deposits - Fair Value of Available-for-Sale Investments in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Unrealized Losses
Less Than 12 Months	$ (36)	$ (17)
12 Months or More	(55)	(14)
Fair Value
Less Than 12 Months	2,555	2,658
12 Months or More	2,420	689
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Unrealized Losses
Less Than 12 Months	0	(1)
12 Months or More	(2)	(1)
Fair Value
Less Than 12 Months	59	222
12 Months or More	202	79
Corporate securities
Unrealized Losses
Less Than 12 Months	(27)	(6)
12 Months or More	(25)	(4)
Fair Value
Less Than 12 Months	1,389	1,044
12 Months or More	871	185
Municipal securities
Unrealized Losses
Less Than 12 Months	(4)	(7)
12 Months or More	(14)	(3)
Fair Value
Less Than 12 Months	591	943
12 Months or More	806	175
Asset-backed securities
Unrealized Losses
Less Than 12 Months	(2)	(1)
12 Months or More	(2)	0
Fair Value
Less Than 12 Months	318	228
12 Months or More	168	28
Residential mortgage-backed securities
Unrealized Losses
Less Than 12 Months	(1)	(1)
12 Months or More	(8)	(5)
Fair Value
Less Than 12 Months	61	109
12 Months or More	233	171
Commercial mortgage- backed securities
Unrealized Losses
Less Than 12 Months	(2)	(1)
12 Months or More	(4)	(1)
Fair Value
Less Than 12 Months	137	112
12 Months or More	$ 140	$ 51

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

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