v3.20.4
Pension and Postretirement Benefit Plans and Defined Contribution Plans - Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Postretirement Benefits Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1] $ 1,667 $ 1,870  
Service cost 38 37 $ 39
Interest cost 49 75 72
Employee contributions 88 84  
Plan amendments (56) (56)  
Changes in actuarial assumptions and other [2] (132) (87)  
Foreign exchange impact 2 (1)  
Upjohn spin-off [3] (218) 0  
Acquisitions/divestitures/other, net 0 (36)  
Curtailments 0 0  
Settlements 0 0  
Special termination benefits 0 2  
Benefits paid (201) (221)  
Benefit obligation, ending [1] 1,238 1,667 1,870
Change in plan assets      
Fair value, beginning 519 469  
Actual gain/(loss) on plan assets 69 50  
Company contributions 113 137  
Employee contributions 88 84  
Foreign exchange impact 0 0  
Upjohn spin-off [3] 0 0  
Acquisitions/divestitures, net 0 0  
Settlements 0 0  
Benefits paid (201) (221)  
Fair value, ending 588 519 469
Funded status—Plan assets less than benefit obligation (651) (1,148)  
US [Member] | Pension Plan [Member]      
Change in plan assets      
Fair value, beginning 14,586    
Fair value, ending 16,094 14,586  
US [Member] | Pension Plan [Member] | Qualified Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1] 16,535 15,141  
Service cost 0 0 0
Interest cost 499 629 598
Employee contributions 0 0  
Plan amendments 2 0  
Changes in actuarial assumptions and other [2] 1,953 2,001  
Foreign exchange impact 0 0  
Upjohn spin-off [3] (1,016) 0  
Acquisitions/divestitures/other, net 0 (4)  
Curtailments 0 0  
Settlements (650) (692)  
Special termination benefits (1) 4  
Benefits paid (383) (544)  
Benefit obligation, ending [1] 16,940 16,535 15,141
Change in plan assets      
Fair value, beginning 14,586 13,051  
Actual gain/(loss) on plan assets 1,974 2,760  
Company contributions 1,253 11  
Employee contributions 0 0  
Foreign exchange impact 0 0  
Upjohn spin-off [3] (687) 0  
Acquisitions/divestitures, net 0    
Settlements (650) (692)  
Benefits paid (383) (544)  
Fair value, ending 16,094 14,586 13,051
Funded status—Plan assets less than benefit obligation (845) (1,949)  
US [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member] | Non-Qualified Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1] 1,351 1,280  
Service cost 0 0 0
Interest cost 34 47 55
Employee contributions 0 0  
Plan amendments 0 0  
Changes in actuarial assumptions and other [2] 159 152  
Foreign exchange impact 0 0  
Upjohn spin-off [3] 0 0  
Acquisitions/divestitures/other, net 0 (1)  
Curtailments 0 0  
Settlements (117) (70)  
Special termination benefits 2 17  
Benefits paid (62) (74)  
Benefit obligation, ending [1] 1,366 1,351 1,280
Change in plan assets      
Fair value, beginning 0 0  
Company contributions 179 144  
Employee contributions 0 0  
Foreign exchange impact 0 0  
Upjohn spin-off [3] 0 0  
Settlements (117) (70)  
Benefits paid (62) (74)  
Fair value, ending 0 0 0
Funded status—Plan assets less than benefit obligation (1,366) (1,351)  
International [Member] | Pension Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1] 11,059 9,952  
Service cost 146 125 136
Interest cost 164 215 212
Employee contributions 8 7  
Plan amendments 2 18  
Changes in actuarial assumptions and other [2] 702 1,224  
Foreign exchange impact 646 (33)  
Upjohn spin-off [3] (320) 0  
Acquisitions/divestitures/other, net 0 (55)  
Curtailments 0 (2)  
Settlements (34) (34)  
Special termination benefits 0 0  
Benefits paid (372) (360)  
Benefit obligation, ending [1] 12,001 11,059 9,952
Change in plan assets      
Fair value, beginning 8,956 8,215  
Actual gain/(loss) on plan assets 868 873  
Company contributions 197 230  
Employee contributions 8 7  
Foreign exchange impact 462 42  
Upjohn spin-off [3] (270) 0  
Acquisitions/divestitures, net (6) (16)  
Settlements (34) (34)  
Benefits paid (372) (360)  
Fair value, ending 9,811 8,956 $ 8,215
Funded status—Plan assets less than benefit obligation (2,191) (2,103)  
Defined benefit plan, accumulated benefit obligation $ 11,500 $ 10,600  
[1] The PBO represents the present value of the benefit obligation earned through the end of the year and factors in future compensation increases. The ABO is similar to the PBO but does not factor in future compensation increases. For the U.S. qualified and supplemental (non-qualified) pension plans, the benefit obligation is the PBO, which is also equal to the ABO. For the international pension plans, the benefit obligation is the PBO. The ABO for our international pension plans was $11.5 billion in 2020 and $10.6 billion in 2019. For the postretirement plans, the benefit obligation is the ABO.
[2] Primarily includes actuarial losses resulting from decreases in discount rates in 2020 and 2019.
[3] For more information, see Note 2B.