Quarterly report pursuant to Section 13 or 15(d)

Short-term and Long-term Investments, Restricted Deposits - Contractual Maturities of Short-Term and Long-Term Investments and Restricted Deposits (Details)

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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, 2020
Dec. 31, 2019
Investments    
Amortized Cost    
One year or less $ 1,239 $ 750
One year through five years 3,954 3,034
Five years through ten years 2,430 2,162
Greater than ten years 72 48
Asset-backed securities 2,636 1,585
Amortized Cost 10,331 7,579
Fair Value    
One year or less 1,237 752
One year through five years 3,935 3,106
Five years through ten years 2,465 2,257
Greater than ten years 74 50
Asset-backed securities 2,633 1,603
Fair Value 10,344 7,768
Restricted Deposits    
Amortized Cost    
One year or less 841 550
One year through five years 169 106
Five years through ten years 0 0
Greater than ten years 0 0
Asset-backed securities 0 0
Amortized Cost 1,010 656
Fair Value    
One year or less 842 550
One year through five years 172 108
Five years through ten years 0 0
Greater than ten years 0 0
Asset-backed securities 0 0
Fair Value $ 1,014 $ 658