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Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Intangible Assets |  |
Cost | $ 19,141 | $ 18,564
Accumulated Amortization | (5,213) | (2,766)
Net | 13,928 | 15,798
Trademarks |  |
Intangible Assets |  |
Cost | 44 | 43
Accumulated Amortization | 0 | 0
Net | 44 | 43
Customer relationships and other |  |
Intangible Assets |  |
Cost | 18,586 | 18,018
Accumulated Amortization | (5,024) | (2,681)
Net | 13,562 | 15,337
Trademarks |  |
Intangible Assets |  |
Cost | 511 | 503
Accumulated Amortization | (189) | (85)
Net | $ 322 | $ 418

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