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Overview and Summary of Significant Accounting Policies - Effects of Changes in the Presentation of Financial Statements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating expenses:      
Transaction expense $ 4,419 $ 3,346 $ 2,610
Transaction and loan losses 1,011 1,088 809
Customer support and operations 1,364 1,267 1,110
Sales and marketing 1,128 969 937
Product development 953 834 792
General and administrative 1,155 1,028 873
Depreciation and amortization 805 724 608
Other operating expenses     48
Total operating expenses 10,967 9,256 7,787
Cash flows from investing activities:      
Purchases of investments (19,418) (21,041) (21,626)
Maturities and sales of investments 18,450 18,429 16,148
Funds receivable and customer accounts $ (2,480) $ (176) (395)
Cash flows from financing activities:      
Funds receivable and customer accounts     0
Net change     (5,873)
As Reported      
Operating expenses:      
Transaction expense     2,610
Transaction and loan losses     809
Customer support and operations     1,220
Sales and marketing     985
Product development     947
General and administrative     560
Depreciation and amortization     608
Other operating expenses     48
Total operating expenses     7,787
Cash flows from investing activities:      
Purchases of investments     (7,542)
Maturities and sales of investments     3,318
Funds receivable and customer accounts     0
Cash flows from financing activities:      
Funds receivable and customer accounts     (1,649)
Net change     (5,873)
Adjustments      
Operating expenses:      
Transaction expense     0
Transaction and loan losses     0
Customer support and operations     (110)
Sales and marketing     (48)
Product development     (155)
General and administrative     313
Depreciation and amortization     0
Other operating expenses     0
Total operating expenses     0
Cash flows from investing activities:      
Purchases of investments     (14,084)
Maturities and sales of investments     12,830
Funds receivable and customer accounts     (395)
Cash flows from financing activities:      
Funds receivable and customer accounts     1,649
Net change     $ 0