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)

v3.20.2
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