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Funds Receivable and Customer Accounts and Investments - Estimated Fair Value of Investments Classified as Available for Sale (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost $ 22,953 $ 21,584
Gross Unrealized Gains 7 12
Gross Unrealized Losses (11) (1)
Estimated Fair Value 22,949 21,595
Funds receivable and customer accounts | U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 8,013 7,929
Gross Unrealized Gains 4 4
Gross Unrealized Losses (2) 0
Estimated Fair Value 8,015 7,933
Funds receivable and customer accounts | Foreign government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 1,877 1,504
Gross Unrealized Gains 0 2
Gross Unrealized Losses (2) 0
Estimated Fair Value 1,875 1,506
Funds receivable and customer accounts | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 3,558 2,011
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2) 0
Estimated Fair Value 3,556 2,011
Funds receivable and customer accounts | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 443  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Estimated Fair Value 443  
Funds receivable and customer accounts | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 633 637
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 633 637
Short term investments | U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 1,340 1,510
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 1,340 1,510
Short term investments | Foreign government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 444 277
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 444 277
Short term investments | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 3,421 4,900
Gross Unrealized Gains 1 2
Gross Unrealized Losses 0 0
Estimated Fair Value 3,422 4,902
Short term investments | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 147  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Estimated Fair Value 147  
Long-term investments | U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost   28
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Estimated Fair Value   28
Long-term investments | Foreign government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 1,506 1,305
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2) (1)
Estimated Fair Value 1,504 1,304
Long-term investments | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 1,406 1,255
Gross Unrealized Gains 2 4
Gross Unrealized Losses (3) 0
Estimated Fair Value 1,405 1,259
Long-term investments | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Amortized Cost 165 228
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value $ 165 $ 228