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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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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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