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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Intangible Assets by Major Class [Line Items] |  |
Gross Carrying Amount, Finite-lived | $ 5,743 | $ 5,347
Accumulated Amortization | $ (3,469) | (3,180)
Weighted-Average Amortization Period (in years) | 7 years 8 months 12 days |
Accumulated Amortization | $ (3,469) | (3,180)
Net Carrying Value | 2,274 | 2,167
Trademarks, patents, and other [Member] [Member] |  |
Intangible Assets by Major Class [Line Items] |  |
Gross Carrying Amount, Finite-lived | 18 | 29
Accumulated Amortization | $ (13) | (21)
Weighted-Average Amortization Period (in years) | 12 years |
Accumulated Amortization | $ (13) | (21)
Net Carrying Value | 5 | 8
Capitalized software |  |
Intangible Assets by Major Class [Line Items] |  |
Gross Carrying Amount, Finite-lived | 4,531 | 4,125
Accumulated Amortization | $ (2,962) | (2,704)
Weighted-Average Amortization Period (in years) | 6 years 10 months 24 days |
Accumulated Amortization | $ (2,962) | (2,704)
Net Carrying Value | 1,569 | 1,421
Customer relationships |  |
Intangible Assets by Major Class [Line Items] |  |
Gross Carrying Amount, Finite-lived | 729 | 730
Accumulated Amortization | $ (344) | (282)
Weighted-Average Amortization Period (in years) | 10 years 7 months 6 days |
Accumulated Amortization | $ (344) | (282)
Net Carrying Value | 385 | 448
Trade Names |  |
Intangible Assets by Major Class [Line Items] |  |
Gross Carrying Amount, Finite-lived | 200 | 200
Accumulated Amortization | 0 | 0
Accumulated Amortization | 0 | 0
Net Carrying Value | 200 | 200
Franchise rights |  |
Intangible Assets by Major Class [Line Items] |  |
Gross Carrying Amount, Finite-lived | 165 | 146
Accumulated Amortization | $ (113) | (109)
Weighted-Average Amortization Period (in years) | 20 years |
Accumulated Amortization | $ (113) | (109)
Net Carrying Value | 52 | 37
Licenses |  |
Intangible Assets by Major Class [Line Items] |  |
Gross Carrying Amount, Finite-lived | 100 | 117
Accumulated Amortization | $ (37) | (64)
Weighted-Average Amortization Period (in years) | 3 years 9 months 18 days |
Accumulated Amortization | $ (37) | (64)
Net Carrying Value | $ 63 | $ 53

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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 Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: 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),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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