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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets |  |
Intangible assets, accumulated amortization | $ (6,864) | $ (6,299)
Intangible assets, gross carrying amount | 20,030 | 19,929
Intangible assets, net carrying amount | 13,166 | 13,630
Customer contracts and relationships and covenants not to compete |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 12,507 | 12,341
Intangible assets, accumulated amortization | (6,059) | (5,536)
Net Carrying Amount | 6,448 | 6,805
Favorable leases and other |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 1,125 | 1,190
Intangible assets, accumulated amortization | (805) | (763)
Net Carrying Amount | 320 | 427
Trademarks (indefinitely-lived) |  |
Finite-Lived Intangible Assets |  |
Indefinite-lived intangible assets | $ 6,398 | $ 6,398

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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/presentationRef -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/presentationRef -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 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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