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Restructuring and Other Charges - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Integration activities charges | $ 303 | $ 56 |
Non-cash impairment charges | 124 | 48 | $ 3
Accelerated amortization expense included within finance lease expense | 62 |  |
Accelerated amortization expense | 56 |  |
Employee Termination Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs | 131 | 32 |
Employee severance and other separation costs accrual | 27 | 14 | $ 0
Share-based compensation costs | $ 48 | $ 23 |

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