v3.10.0.1
Pension and Postretirement Benefit Plans and Defined Contribution Plans - Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Postretirement Benefits Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1],[2] $ 2,028 $ 2,254  
Service cost [3] 39 [1],[2] 42 [1],[2] $ 41
Interest cost 72 [1],[2] 90 [1],[2] 101
Employee contributions [1],[2] 102 94  
Plan amendments [1],[2] 2 0  
Changes in actuarial assumptions and other [1],[2] (122) (177)  
Foreign exchange impact [1],[2] (4) 5  
Acquisitions/divestitures/other, net [1],[2] 0 1  
Curtailments [1],[2] (1) 1  
Settlements [1],[2] 0 0  
Special termination benefits 2 [1],[2] 0 [1],[2] 0
Benefits paid [1],[2] (249) (280)  
Benefit obligation, ending [1],[2] 1,870 2,028 2,254
Change in plan assets      
Fair value of plan assets, beginning [2] 494 [4] 458  
Actual gain/(loss) on plan assets [2] (22) 39  
Company contributions [2] 145 183  
Employee contributions [2] 102 94  
Foreign exchange impact [2] 0 0  
Acquisitions/divestitures, net [2] 0 0  
Settlements [2] 0 0  
Benefits paid [2] (249) (280)  
Fair value of plan assets, ending [2] 469 [4] 494 [4] 458
Funded status—Plan assets less than benefit obligation [2] (1,401) (1,534)  
United States [Member] | Pension Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1],[5] 16,702 15,547  
Service cost [1],[5] 0 269  
Interest cost [1],[5] 598 634  
Employee contributions [1],[5] 0 0  
Plan amendments [1],[5] (22) 0  
Changes in actuarial assumptions and other [1],[5] (1,219) 1,614  
Foreign exchange impact [1],[5] 0 0  
Acquisitions/divestitures/other, net [1],[5] 0 0  
Curtailments [1],[5] 11 11  
Settlements [1],[5] (391) (842)  
Special termination benefits [1],[5] 6 0  
Benefits paid [1],[5] (546) (530)  
Benefit obligation, ending [1],[5] 15,141 16,702 15,547
Change in plan assets      
Fair value of plan assets, beginning [5] 14,284 12,556  
Actual gain/(loss) on plan assets [5] (796) 2,005  
Company contributions [5] 500 1,095  
Employee contributions [5] 0 0  
Foreign exchange impact [5] 0 0  
Acquisitions/divestitures, net [5] 0    
Settlements [5] (391) (842)  
Benefits paid [5] (546) (530)  
Fair value of plan assets, ending [5] 13,051 14,284 12,556
Funded status—Plan assets less than benefit obligation [5] (2,089) (2,418)  
Defined benefit plan, accumulated benefit obligation 15,100 16,700  
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1] 1,495 1,450  
Service cost [1] 0 24  
Interest cost [1] 55 54  
Employee contributions [1] 0 0  
Plan amendments [1] 0 0  
Changes in actuarial assumptions and other [1] (152) 110  
Foreign exchange impact [1] 0 0  
Acquisitions/divestitures/other, net [1] 0 0  
Curtailments [1] 1 0  
Settlements [1] (72) (98)  
Special termination benefits [1] 10 0  
Benefits paid [1] (58) (45)  
Benefit obligation, ending [1] 1,280 1,495 1,450
Change in plan assets      
Fair value of plan assets, beginning 0 0  
Company contributions 129 143  
Employee contributions 0 0  
Foreign exchange impact 0 0  
Settlements (72) (98)  
Benefits paid (58) (45)  
Fair value of plan assets, ending 0 0 0
Funded status—Plan assets less than benefit obligation (1,280) (1,495)  
Defined benefit plan, accumulated benefit obligation 1,300 1,500  
Foreign Plan [Member] | Pension Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning [1],[6] 10,607 9,691  
Service cost [3] 136 [1],[6] 171 [1],[6] 165
Interest cost 212 [1],[6] 204 [1],[6] 233
Employee contributions [1],[6] 7 6  
Plan amendments [1],[6] 29 2  
Changes in actuarial assumptions and other [1],[6] (169) 135  
Foreign exchange impact [1],[6] (457) 760  
Acquisitions/divestitures/other, net [1],[6] (2) 26  
Curtailments [1],[6] (3) 0  
Settlements [1],[6] (34) (31)  
Special termination benefits 0 [1],[6] 1 [1],[6] 1
Benefits paid [1],[6] (373) (357)  
Benefit obligation, ending [1],[6] 9,952 10,607 9,691
Change in plan assets      
Fair value of plan assets, beginning [6] 8,863 7,683  
Actual gain/(loss) on plan assets [6] (77) 811  
Company contributions [6] 209 160  
Employee contributions [6] 7 6  
Foreign exchange impact [6] (380) 561  
Acquisitions/divestitures, net [6] 0 30  
Settlements [6] (34) (31)  
Benefits paid [6] (373) (357)  
Fair value of plan assets, ending [6] 8,215 8,863 $ 7,683
Funded status—Plan assets less than benefit obligation [6] (1,738) (1,745)  
Defined benefit plan, accumulated benefit obligation $ 9,500 $ 10,100  
[1] For the U.S. and international pension plans, the benefit obligation is the PBO. For the postretirement plans, the benefit obligation is the ABO. The ABO for all of our U.S. qualified pension plans was $15.1 billion in 2018 and $16.7 billion in 2017. The ABO for our U.S. supplemental (non-qualified) pension plans was $1.3 billion in 2018 and $1.5 billion in 2017. The ABO for our international pension plans was $9.5 billion in 2018 and $10.1 billion in 2017.
[2] The favorable change in the funded status of our postretirement plans was primarily due to an increase in the discount rate at the end of 2018, partially offset by a decrease in actual return on plan assets.
[3] Effective January 1, 2018, we froze two significant defined benefit pension plans to future benefit accruals in the U.S. and U.K. and as a result, service costs for those plans are eliminated. In addition, due to the plan freeze, the average amortization period for the U.S. qualified plans and U.S. supplemental (non-qualified) plans was extended to the expected life expectancy of the plan participants, whereas the average amortization period in prior years utilized the expected future service period of plan participants.
[4] Reflects postretirement plan assets, which support a portion of our U.S. retiree medical plans.
[5] The favorable change in the funded status of our U.S. qualified plans was primarily due to an increase in the discount rate at the end of 2018, partially offset by a decrease in actual return on plan assets.
[6] The favorable change in the international plans’ funded status was primarily due to favorable currency movements, partially offset by a decrease in the actual return on plan assets.