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Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible assets |  |  |  |
Amortization expense related to finite-lived intangible assets |  | $ 817,000,000 | $ 795,000,000 | $ 611,000,000
Anticipated annual amortization expenses |  |  |  |
2018 |  | 817,000,000 |  |
2019 |  | 771,000,000 |  |
2020 |  | 600,000,000 |  |
2021 |  | 539,000,000 |  |
2022 |  | 494,000,000 |  |
Finite-Lived Intangible Assets |  |  |  |
Intangible assets, accumulated amortization |  | (6,299,000,000) | (5,495,000,000) |
Intangible assets, gross carrying amount |  | 19,929,000,000 | 19,006,000,000 |
Intangible assets, net carrying amount |  | $ 13,630,000,000 | 13,511,000,000 |
Weighted Average |  |  |  |
Intangible assets |  |  |  |
Finite-Lived intangible asset, useful life (in years) |  | 15 years 4 months 24 days |  |
Customer contracts and relationships and covenants not to compete |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount |  | $ 12,341,000,000 | 11,485,000,000 |
Intangible assets, accumulated amortization |  | (5,536,000,000) | (4,802,000,000) |
Net Carrying Amount |  | $ 6,805,000,000 | 6,683,000,000 |
Customer contracts and relationships and covenants not to compete | Weighted Average |  |  |  |
Intangible assets |  |  |  |
Finite-Lived intangible asset, useful life (in years) |  | 15 years 3 months 18 days |  |
Favorable leases and other |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Gross Carrying Amount |  | $ 1,190,000,000 | 1,123,000,000 |
Intangible assets, accumulated amortization |  | (763,000,000) | (693,000,000) |
Net Carrying Amount |  | $ 427,000,000 | 430,000,000 |
Favorable leases and other | Weighted Average |  |  |  |
Intangible assets |  |  |  |
Finite-Lived intangible asset, useful life (in years) |  | 16 years 2 months 12 days |  |
Trademarks (indefinitely-lived) |  |  |  |
Intangible assets |  |  |  |
Impairment of intangible assets, indefinite-lived | $ 0 |  |  |
Finite-Lived Intangible Assets |  |  |  |
Indefinite-lived intangible assets |  | $ 6,398,000,000 | $ 6,398,000,000 |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + 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/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 of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -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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