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Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 11, 2019
Sep. 30, 2019
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]            
Plan assets related to certain insurance contracts     $ 117 $ 124    
Expense for defined contribution plans     $ 66 73 $ 83  
Fixed-income securities | U.S. and International Investment Grade Debt Securities            
Defined Benefit Plan Disclosure [Line Items]            
Target allocation percentage     95.00%      
U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Period for recognition of net periodic benefit costs     4 years      
U.S. Plans | North America | Bakery and Confectionery Union and Industry International Pension Fund            
Defined Benefit Plan Disclosure [Line Items]            
Multiemployer plan, withdrawal obligation $ 526   $ 344      
Multiemployer plan, withdrawal obligation term 20 years          
Multiemployer plan, adjustment related to withdrawal liability   $ 35        
Multiemployer plan, adjustment related to withdrawal liability, net of tax   $ 26        
Multiemployer plan, accreted interest on withdrawal liability       11 11 $ 11
U.S. Plans | North America | Bakery and Confectionery Union and Industry International Pension Fund | Other current liabilities            
Defined Benefit Plan Disclosure [Line Items]            
Multiemployer plan, withdrawal obligation     15      
U.S. Plans | North America | Bakery and Confectionery Union and Industry International Pension Fund | Other long-term liabilities            
Defined Benefit Plan Disclosure [Line Items]            
Multiemployer plan, withdrawal obligation     329      
Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Net pension asset (liability)     583 297    
Pension Plans | U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Accumulated benefit obligation     1,200 $ 1,700    
Employer contribution     4      
Estimated employer contributions during in 2023     $ 6      
Weighted-average discount rate     5.55% 3.01%    
Rate of compensation increase     4.00% 4.00%    
Pension Plans | Non-U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Accumulated benefit obligation     $ 6,800 $ 10,700    
Employer contribution     190      
Employees contribution     21      
Estimated employer contributions during in 2023     $ 119      
Weighted-average discount rate     4.51% 1.73%    
Rate of compensation increase     3.22% 2.83%    
Pension Plans | Non-U.S. Plans | Fixed-income securities            
Defined Benefit Plan Disclosure [Line Items]            
Target allocation percentage     61.00%      
Pension Plans | Non-U.S. Plans | Equity securities            
Defined Benefit Plan Disclosure [Line Items]            
Target allocation percentage     15.00%      
Pension Plans | Non-U.S. Plans | Buy-in annuity policies            
Defined Benefit Plan Disclosure [Line Items]            
Target allocation percentage     20.00%      
Pension Plans | Non-U.S. Plans | Real estate            
Defined Benefit Plan Disclosure [Line Items]            
Target allocation percentage     4.00%      
Postretirement Benefit Plans            
Defined Benefit Plan Disclosure [Line Items]            
Current portion of our accrued postretirement benefit obligation     $ 16 $ 16    
Postretirement Benefit Plans | Multiemployer Medical Plans            
Defined Benefit Plan Disclosure [Line Items]            
Multiemployer plan contributions     $ 17 $ 19 $ 20  
Postretirement Benefit Plans | U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Weighted-average discount rate     5.53% 2.96%    
Postretirement Benefit Plans | Non-U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Weighted-average discount rate     6.07% 3.81%    
Postemployment Benefit Plans            
Defined Benefit Plan Disclosure [Line Items]            
Weighted-average discount rate     6.30% 4.30%    
Ultimate annual turnover rate     0.40% 0.40%    
Rate of compensation increase     4.00% 4.00%    
Net gains for post-employment benefit plans expected to be amortized from other comprehensive earnings/(losses) into cost during 2023     $ (3)