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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 22, 2017 USD ($) | Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating segments | segment |  | 2 |  |  |
Useful life |  | 17 years 1 month 6 days |  |  |
Deferred tax benefit relating to tax cuts and jobs act | $ 764 |  |  | $ 764 |
Percentage of high quality sovereign debt of reverse repurchase |  | 2.00% |  |  |
Banker success fee |  |  | $ 5 |  |
Foreign currency translation adjustments |  | $ 177 | 227 |  |
Foreign currency transaction loss |  | 5 | 2 | 4 |
Net periodic (expense) benefit |  | $ 0 | (1) | 15 |
Impact of adoption of ASU 2018-02 to reclassify items stranded in other comprehensive income |  |  | 0 |  |
Weighted average remaining lease term for operating lease |  | 6 years 8 months 12 days |  |  |
Weighted average discount rate (percent) |  | 3.50% |  |  |
Total operating lease liability |  | $ 334 |  |  | $ 368
Current operating lease liability |  | 53 |  |  | 53
Non-current operating lease liability |  | 281 | 0 |  | 315
Right-of-use lease assets |  | 287 |  |  | 317
Accounting Standards Update 2016-02 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Total operating lease liability |  |  |  |  | 368
Current operating lease liability |  |  |  |  | 53
Non-current operating lease liability |  |  |  |  | 315
Right-of-use lease assets |  |  |  |  | 317
Deferred rent |  |  |  |  | 51
Accounting Standards Update 2017-07 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Net periodic (expense) benefit |  |  | (8) | 9 |
Rent And Occupancy Expense |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease expense |  | 41 |  |  |
Operating lease expense |  |  | 38 | 39 |
Technology And Communication Expense |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease expense |  | $ 21 |  |  |
Operating lease expense |  |  | 21 | $ 19 |
Other Current Liabilities | Accounting Standards Update 2016-02 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred rent |  |  |  |  | 2
Other Noncurrent Liabilities | Accounting Standards Update 2016-02 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred rent |  |  |  |  | $ 49
Software Development |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life |  | 3 years |  |  |
Software and Software Development Costs |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life |  | 7 years |  |  |
Employee stock |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of purchase price of common stock |  | 85.00% |  |  |
Discount from market price |  | 15.00% |  |  |
Retained Earnings |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Impact of adoption of ASU 2018-02 to reclassify items stranded in other comprehensive income |  |  | $ 26 |  |

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