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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