Funds Receivable and Customer Accounts and Investments - Assets Underlying Funds Receivable and Customer Accounts, Short-term Investments, and Long-term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Funds receivable and customer accounts:
Total funds receivable and customer accounts	$ 22,817	$ 22,527
Short-term investments:
Time deposits	204	614
Available-for-sale debt securities	2,060	2,734
Restricted cash	68	64
Short-term Investments	2,332	3,412
Long-term investments:
Available-for-sale debt securities	661	1,025
Restricted cash	6	0
Strategic investments	1,699	1,838
Long-term Investments	2,366	2,863
Cash and cash equivalents
Funds receivable and customer accounts:
Total funds receivable and customer accounts	8,871	8,387
Time deposits
Funds receivable and customer accounts:
Total funds receivable and customer accounts	552	514
Available-for-sale debt securities
Funds receivable and customer accounts:
Total funds receivable and customer accounts	9,614	10,190
Funds receivable
Funds receivable and customer accounts:
Total funds receivable and customer accounts	$ 3,780	$ 3,436