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Short-term and Long-term Investments, Restricted Deposits - Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Unrealized Losses |  |
Less Than 12 Months | $ (6) | $ (36)
12 Months or More | (25) | (55)
Fair Value |  |
Fair Value, Less Than 12 Months | 772 | 2,555
Fair Value, 12 Months or More | 2,244 | 2,420
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (1) | (2)
Fair Value |  |
Fair Value, Less Than 12 Months | 1 | 59
Fair Value, 12 Months or More | 172 | 202
Corporate securities |  |
Unrealized Losses |  |
Less Than 12 Months | (4) | (27)
12 Months or More | (12) | (25)
Fair Value |  |
Fair Value, Less Than 12 Months | 392 | 1,389
Fair Value, 12 Months or More | 1,010 | 871
Municipal securities |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | (4)
12 Months or More | (3) | (14)
Fair Value |  |
Fair Value, Less Than 12 Months | 74 | 591
Fair Value, 12 Months or More | 496 | 806
Asset-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (2) | (2)
12 Months or More | (1) | (2)
Fair Value |  |
Fair Value, Less Than 12 Months | 221 | 318
Fair Value, 12 Months or More | 196 | 168
Residential mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | (1)
12 Months or More | (6) | (8)
Fair Value |  |
Fair Value, Less Than 12 Months | 12 | 61
Fair Value, 12 Months or More | 241 | 233
Commercial mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | (2)
12 Months or More | (2) | (4)
Fair Value |  |
Fair Value, Less Than 12 Months | 72 | 137
Fair Value, 12 Months or More | $ 129 | $ 140

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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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