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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Intangible assets: |  |  |  |  |
Gross Carrying Amount | $ 1,085 |  | $ 1,085 |  | $ 1,087
Accumulated Amortization | (1,066) |  | (1,066) |  | (1,048)
Net Carrying Amount | 19 |  | 19 |  | 39
Amortization expense | 6 | $ 8 | 21 | $ 26 |
Customer lists and user base |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | 356 |  | 356 |  | 356
Accumulated Amortization | (341) |  | (341) |  | (321)
Net Carrying Amount | 15 |  | $ 15 |  | $ 35
Weighted Average Useful Life (Years) |  |  | 3 years |  | 5 years
Marketing related |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | 355 |  | $ 355 |  | $ 360
Accumulated Amortization | (355) |  | (355) |  | (360)
Net Carrying Amount | 0 |  | $ 0 |  | $ 0
Weighted Average Useful Life (Years) |  |  | 0 years |  | 5 years
Developed technologies |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | 215 |  | $ 215 |  | $ 216
Accumulated Amortization | (215) |  | (215) |  | (214)
Net Carrying Amount | 0 |  | $ 0 |  | $ 2
Weighted Average Useful Life (Years) |  |  | 0 years |  | 3 years
All other |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | 159 |  | $ 159 |  | $ 155
Accumulated Amortization | (155) |  | (155) |  | (153)
Net Carrying Amount | $ 4 |  | $ 4 |  | $ 2
Weighted Average Useful Life (Years) |  |  | 3 years |  | 4 years

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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