Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Disaggregation of Revenue [Line Items] | ||
| Net revenues | $ 4,618 | $ 4,128 |
| Transaction revenues | ||
| Disaggregation of Revenue [Line Items] | ||
| Net revenues | 4,215 | 3,731 |
| Other value added services | ||
| Disaggregation of Revenue [Line Items] | ||
| Net revenues | 403 | 397 |
| Interest, fees and gains earned on loan and interest receivables, net and held for sale portfolio, hedging gains and interest earned on customer balances | ||
| Disaggregation of Revenue [Line Items] | ||
| Net revenues which do not represent revenues recognized in the scope of ASC Topic 606 | 247 | 257 |
| United States (“U.S.”) | ||
| Disaggregation of Revenue [Line Items] | ||
| Net revenues | 2,469 | 2,187 |
| United Kingdom (“U.K.”) | ||
| Disaggregation of Revenue [Line Items] | ||
| Net revenues | 478 | 433 |
| Other Countries | ||
| Disaggregation of Revenue [Line Items] | ||
| Net revenues | $ 1,671 | $ 1,508 |