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Short-term and Long-term Investments, Restricted Deposits - Contractual Maturities of Short-Term and Long-Term Investments and Restricted Deposits (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investments |  |
Amortized Cost |  |
One year or less | $ 1,406 | $ 750
One year through five years | 3,847 | 3,034
Five years through ten years | 2,200 | 2,162
Greater than ten years | 64 | 48
Asset-backed securities | 2,446 | 1,585
Amortized Cost | 9,963 | 7,579
Fair Value |  |
One year or less | 1,414 | 752
One year through five years | 3,986 | 3,106
Five years through ten years | 2,346 | 2,257
Greater than ten years | 68 | 50
Asset-backed securities | 2,490 | 1,603
Fair Value | 10,304 | 7,768
Restricted Deposits |  |
Amortized Cost |  |
One year or less | 881 | 550
One year through five years | 151 | 106
Five years through ten years | 13 | 0
Greater than ten years | 0 | 0
Asset-backed securities | 0 | 0
Amortized Cost | 1,045 | 656
Fair Value |  |
One year or less | 882 | 550
One year through five years | 154 | 108
Five years through ten years | 14 | 0
Greater than ten years | 0 | 0
Asset-backed securities | 0 | 0
Fair Value | $ 1,050 | $ 658

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