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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 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Unrealized Losses |  |
Less Than 12 Months | $ (53) | $ (16)
12 Months or More | (5) | (2)
Fair Value |  |
Fair Value, Less Than 12 Months | 5,052 | 1,699
Fair Value, 12 Months or More | 171 | 144
Corporate securities |  |
Unrealized Losses |  |
Less Than 12 Months | (35) | (7)
12 Months or More | (2) | (1)
Fair Value |  |
Fair Value, Less Than 12 Months | 3,089 | 953
Fair Value, 12 Months or More | 75 | 24
Municipal securities |  |
Unrealized Losses |  |
Less Than 12 Months | (7) | (2)
12 Months or More | (1) | 0
Fair Value |  |
Fair Value, Less Than 12 Months | 929 | 238
Fair Value, 12 Months or More | 26 | 0
Asset-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (1) | (2)
12 Months or More | 0 | (1)
Fair Value |  |
Fair Value, Less Than 12 Months | 334 | 302
Fair Value, 12 Months or More | 36 | 105
Residential mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (6) | 0
12 Months or More | 0 | 0
Fair Value |  |
Fair Value, Less Than 12 Months | 428 | 59
Fair Value, 12 Months or More | 1 | 2
Commercial mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (4) | (5)
12 Months or More | (2) | 0
Fair Value |  |
Fair Value, Less Than 12 Months | 272 | 147
Fair Value, 12 Months or More | $ 33 | $ 13

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