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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
Dec. 31, 2018
Dec. 31, 2017
Investments    
Amortized Cost    
One year or less $ 647 $ 474
One year through five years 3,026 2,424
Five years through ten years 2,387 1,773
Greater than ten years 88 129
Asset-backed securities 1,504 1,046
Total 7,652 5,846
Fair Value    
One year or less 646 474
One year through five years 2,998 2,420
Five years through ten years 2,362 1,779
Greater than ten years 89 130
Asset-backed securities 1,488 1,040
Total 7,583 5,843
Restricted Deposits    
Amortized Cost    
One year or less 205 48
One year through five years 351 88
Five years through ten years 0 0
Greater than ten years 0 0
Asset-backed securities 0 0
Total 556 136
Fair Value    
One year or less 205 47
Five years through ten years 0 0
One year through five years 350 88
Greater than ten years 0 0
Asset-backed securities 0 0
Total $ 555 $ 135