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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jan. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Weighted average remaining lease term for operating lease | 6 years 10 months 24 days | 6 years 10 months 24 days |
Weighted average discount rate (percent) | 3.60% | 3.60% |
Operating lease liabilities | $ 339 | $ 339 | $ 357
Current operating lease liability | 52 | 52 | 52
Non-current operating lease liability | 287 | 287 | 305
Operating lease right of use assets | 292 | 292 | 308
Rent And Occupancy Expense |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Lease rent expense | 9 | 29 |
Technology And Communication Expense |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Lease rent expense | $ 5 | $ 16 |
Accounting Standards Update 2016-02 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Operating lease liabilities |  |  | 357
Current operating lease liability |  |  | 52
Non-current operating lease liability |  |  | 305
Operating lease right of use assets |  |  | 308
Deferred rent liabilities eliminated |  |  | 49
Accounting Standards Update 2016-02 | Other Current Liabilities |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred rent liabilities eliminated |  |  | 2
Accounting Standards Update 2016-02 | Other Noncurrent Liabilities |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred rent liabilities eliminated |  |  | $ 47

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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