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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investments |  |
Investments, Amortized Cost |  |
One year or less | $ 610 | $ 647
One year through five years | 3,112 | 3,026
Five years through ten years | 2,477 | 2,387
Greater than ten years | 67 | 88
Asset-backed securities | 1,563 | 1,504
Total Investments, Amortized Cost | 7,829 | 7,652
Investments, Fair Value |  |
One year or less | 609 | 646
One year through five years | 3,130 | 2,998
Five years through ten years | 2,512 | 2,362
Greater than ten years | 69 | 89
Asset-backed securities | 1,563 | 1,488
Total Investments, Fair Value | 7,883 | 7,583
Restricted Deposits |  |
Restricted Deposits, Amortized Cost |  |
One year or less | 515 | 205
One year through five years | 67 | 351
Five years through ten years | 0 | 0
Greater than ten years | 0 | 0
Asset-backed securities | 0 | 0
Total Restricted Deposits, Amortized Cost | 582 | 556
Restricted Deposits, Fair Value |  |
One year or less | 515 | 205
One year through five years | 67 | 350
Five years through ten years | 0 | 0
Greater than ten years | 0 | 0
Asset-backed securities | 0 | 0
Total Restricted Deposits, Fair Value | $ 582 | $ 555

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