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Goodwill and Intangible Assets - Components of Identifiable Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 2,969 | $ 2,975
Accumulated Amortization | (2,031) | (1,927)
Net Carrying Amount | 938 | 1,048
Customer lists and user base |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,201 | 1,206
Accumulated Amortization | (822) | (797)
Net Carrying Amount | $ 379 | $ 409
Weighted Average Useful Life (Years) | 6 years | 6 years
Marketing related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 321 | $ 321
Accumulated Amortization | (289) | (278)
Net Carrying Amount | $ 32 | $ 43
Weighted Average Useful Life (Years) | 3 years | 3 years
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 999 | $ 999
Accumulated Amortization | (638) | (577)
Net Carrying Amount | $ 361 | $ 422
Weighted Average Useful Life (Years) | 3 years | 3 years
All other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 448 | $ 449
Accumulated Amortization | (282) | (275)
Net Carrying Amount | $ 166 | $ 174
Weighted Average Useful Life (Years) | 7 years | 7 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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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