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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 9,360 | $ 9,360
Finite-lived intangible assets, net | 454 | 779
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, net | 179 | 468
Accumulated amortization | 5,520 | 5,231
Other Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, net | 275 | 311
Accumulated amortization | $ 1,813 | $ 1,780

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