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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Amortized Cost    
Within one year $ 22,313  
After one year through five years 2,175  
After five years through ten years 31  
After ten years 18  
Amortized Cost 24,537 $ 24,216
Fair Value    
Within one year 22,294  
After one year through five years 2,172  
After five years through ten years 31  
After ten years 18  
Available-for-sale debt securities $ 24,515 $ 24,164