v3.20.4
Post-Employment Benefits - Benefit Plan Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized on the consolidated balance sheets      
Other long-term liabilities $ (3,413) $ (2,949)  
Defined benefit plans      
Projected benefit obligations      
Beginning of period 8,646 6,618  
Service cost 370 269 $ 285
Interest cost 264 259 227
Employee contributions 2 2  
Amendments 0 0  
Actuarial loss 1,105 1,703  
Benefits paid (249) (206)  
Acquisition 1,409 0  
Other, primarily foreign currency translation adjustments 245 1  
End of period 11,792 8,646 6,618
Fair value of plan assets      
Beginning of period 7,116 5,637  
Actual return on plan assets 979 946  
Company contributions 367 727  
Employee contributions 2 2  
Benefits paid (249) (206)  
Acquisition 1,296 0  
Other, primarily foreign currency translation adjustments 191 10  
End of period 9,702 7,116 5,637
Funded status, end of period (2,090) (1,530)  
Amounts recognized on the consolidated balance sheets      
Other assets 563 395  
Accounts payable and accrued liabilities (12) (8)  
Other long-term liabilities (2,641) (1,917)  
Net obligation (2,090) (1,530)  
Actuarial loss, net 4,163 3,633  
Prior service cost (credit) 8 10  
Accumulated other comprehensive loss 4,171 3,643  
Other post-employment plans      
Projected benefit obligations      
Beginning of period 1,050 561  
Service cost 42 25 26
Interest cost 34 29 25
Amendments (397)    
Actuarial loss 40 451  
Benefits paid (17) (17)  
Acquisition 43 0  
Other, primarily foreign currency translation adjustments 0 1  
End of period 795 1,050 $ 561
Fair value of plan assets      
Company contributions 17 17  
Benefits paid (17) (17)  
Acquisition 0 0  
Funded status, end of period (795) (1,050)  
Amounts recognized on the consolidated balance sheets      
Accounts payable and accrued liabilities (23) (18)  
Other long-term liabilities (772) (1,032)  
Net obligation (795) (1,050)  
Actuarial loss, net 482 469  
Prior service cost (credit) (408) (16)  
Accumulated other comprehensive loss $ 74 $ 453