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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Unrealized Losses |  |
Less Than 12 Months | $ (51) | $ (5)
12 Months or More | (7) | (4)
Fair Value |  |
Fair Value, Less Than 12 Months | 1,297 | 692
Fair Value, 12 Months or More | 140 | 312
Corporate securities |  |
Unrealized Losses |  |
Less Than 12 Months | (29) | (2)
12 Months or More | (3) | (2)
Fair Value |  |
Fair Value, Less Than 12 Months | 627 | 192
Fair Value, 12 Months or More | 21 | 48
Municipal securities |  |
Unrealized Losses |  |
Less Than 12 Months | (5) | (1)
12 Months or More | 0 | 0
Fair Value |  |
Fair Value, Less Than 12 Months | 162 | 185
Fair Value, 12 Months or More | 1 | 11
Asset-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (10) | (1)
12 Months or More | (3) | (1)
Fair Value |  |
Fair Value, Less Than 12 Months | 334 | 153
Fair Value, 12 Months or More | 105 | 151
Residential mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | (1)
Fair Value |  |
Fair Value, Less Than 12 Months | 27 | 44
Fair Value, 12 Months or More | 4 | 81
Commercial mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (7) | (1)
12 Months or More | (1) | 0
Fair Value |  |
Fair Value, Less Than 12 Months | 147 | 118
Fair Value, 12 Months or More | $ 9 | $ 21

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