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Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 11, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
U.S. Plans | North America          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer plan, withdrawal liability $ 526 $ 364   $ 364  
Multiemployer plan, withdrawal obligation term 20 years        
Multiemployer plan, accreted interest on the long-term liability   2 $ 3 8 $ 9
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   350   350  
Pension Plans | U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution       7  
Estimated future employer contributions over the remainder of 2021   1   1  
Pension Plans | Non-U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution       173  
Estimated future employer contributions over the remainder of 2021   $ 55   55  
Pension Plans | United Kingdom and Ireland          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution       $ 88