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Benefit Plans - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 11, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
U.S. Plans | North America |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer plan, withdrawal liability | $ 526 | $ 368 |  | $ 368 |
Multiemployer plan, withdrawal obligation term | 20 years |  |  |  |
Multiemployer plan, accreted interest on the long-term liability |  | 3 | $ 3 | 6 | $ 6
Other current liabilities | U.S. Plans | North America |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer plan, withdrawal liability |  | 14 |  | 14 |
Long-term other liabilities | U.S. Plans | North America |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer plan, withdrawal liability |  | 354 |  | 354 |
Pension Plans | U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contribution |  |  |  | 4 |
Estimated future employer contributions over the remainder of 2021 |  | 4 |  | 4 |
Pension Plans | Non-U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contribution |  |  |  | 117 |
Estimated future employer contributions over the remainder of 2021 |  | $ 111 |  | 111 |
Pension Plans | United Kingdom and Ireland |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contribution |  |  |  | $ 59 |

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