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RETIREMENT BENEFITS - Funded Status and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in AOCI      
Subsidy received under the EGWP $ 40 $ 22  
U.S.      
Change in plan assets      
Plan assets at fair value at beginning of year 13,062    
Plan assets at fair value at year end 13,640 13,062  
Amounts recognized in AOCI      
Net amount recognized in equity-pretax 17 15  
U.S. | Pension Plans      
Change in projected benefit obligation      
Projected benefit obligation at beginning of year 13,453 12,655  
Benefits earned during the year 0 1 $ 1
Interest cost on benefit obligation 378 469 514
Plan amendments 0 0  
Actuarial loss (gain) 950 1,263  
Benefits paid, net of participants’ contributions and government subsidy (966) (936)  
Settlement gain 0 0  
Curtailment loss (gain) 0 1  
Foreign exchange impact and other 0 0  
Projected benefit obligation at period end 13,815 13,453 12,655
Change in plan assets      
Plan assets at fair value at beginning of year 12,717 11,490  
Actual return on assets 1,502 1,682  
Company contributions (reimbursements) 56 481  
Benefits paid, net of participants’ contributions and government subsidy (966) (936)  
Settlement gain 0 0  
Foreign exchange impact and other 0 0  
Plan assets at fair value at year end 13,309 12,717 11,490
Funded status of the plans (506) (736)  
Net amount recognized      
Net amount recognized on the balance sheet (506) (736)  
Amounts recognized in AOCI      
Net transition obligation 0 0  
Prior service (cost) benefit (10) (12)  
Net actuarial (loss) gain (7,132) (7,092)  
Net amount recognized in equity-pretax (7,142) (7,104)  
Accumulated benefit obligation at period end 13,812 13,447  
U.S. | Postretirement Benefit Plans      
Change in projected benefit obligation      
Projected benefit obligation at beginning of year 692 662  
Benefits earned during the year 0 0 0
Interest cost on benefit obligation 17 24 26
Plan amendments (104) 0  
Actuarial loss (gain) (18) 46  
Benefits paid, net of participants’ contributions and government subsidy (28) (40)  
Settlement gain 0 0  
Curtailment loss (gain) 0 0  
Foreign exchange impact and other 0 0  
Projected benefit obligation at period end 559 692 662
Change in plan assets      
Plan assets at fair value at beginning of year 345 345  
Actual return on assets 29 36  
Company contributions (reimbursements) (15) 4  
Benefits paid, net of participants’ contributions and government subsidy (28) (40)  
Settlement gain 0 0  
Foreign exchange impact and other 0 0  
Plan assets at fair value at year end 331 345 345
Funded status of the plans (228) (347)  
Net amount recognized      
Net amount recognized on the balance sheet (228) (347)  
Amounts recognized in AOCI      
Net transition obligation 0 0  
Prior service (cost) benefit 101 0  
Net actuarial (loss) gain 56 24  
Net amount recognized in equity-pretax 157 24  
Accumulated benefit obligation at period end 559 692  
Non-U.S.      
Change in plan assets      
Plan assets at fair value at beginning of year 8,683    
Plan assets at fair value at year end 8,977 8,683  
Non-U.S. | Pension Plans      
Change in projected benefit obligation      
Projected benefit obligation at beginning of year 8,105 7,149  
Benefits earned during the year 147 146 146
Interest cost on benefit obligation 246 287 292
Plan amendments (4) 7  
Actuarial loss (gain) 518 861  
Benefits paid, net of participants’ contributions and government subsidy (298) (304)  
Settlement gain (110) (84)  
Curtailment loss (gain) (14) (4)  
Foreign exchange impact and other 39 47  
Projected benefit obligation at period end 8,629 8,105 7,149
Change in plan assets      
Plan assets at fair value at beginning of year 7,556 6,699  
Actual return on assets 584 781  
Company contributions (reimbursements) 158 150  
Benefits paid, net of participants’ contributions and government subsidy (298) (304)  
Settlement gain (110) (84)  
Foreign exchange impact and other (59) 314  
Plan assets at fair value at year end 7,831 7,556 6,699
Funded status of the plans (798) (549)  
Net amount recognized      
Net amount recognized on the balance sheet (798) (549)  
Amounts recognized in AOCI      
Net transition obligation 0 0  
Prior service (cost) benefit 12 1  
Net actuarial (loss) gain (1,863) (1,735)  
Net amount recognized in equity-pretax (1,851) (1,734)  
Accumulated benefit obligation at period end 8,116 7,618  
Non-U.S. | Postretirement Benefit Plans      
Change in projected benefit obligation      
Projected benefit obligation at beginning of year 1,384 1,159  
Benefits earned during the year 7 8 9
Interest cost on benefit obligation 93 104 102
Plan amendments 0 0  
Actuarial loss (gain) 30 140  
Benefits paid, net of participants’ contributions and government subsidy (64) (72)  
Settlement gain 0 0  
Curtailment loss (gain) 0 0  
Foreign exchange impact and other (60) 45  
Projected benefit obligation at period end 1,390 1,384 1,159
Change in plan assets      
Plan assets at fair value at beginning of year 1,127 1,036  
Actual return on assets 129 138  
Company contributions (reimbursements) 9 225  
Benefits paid, net of participants’ contributions and government subsidy (64) (72)  
Settlement gain 0 0  
Foreign exchange impact and other (55) (200)  
Plan assets at fair value at year end 1,146 1,127 $ 1,036
Funded status of the plans (244) (257)  
Net amount recognized      
Net amount recognized on the balance sheet (244) (257)  
Amounts recognized in AOCI      
Net transition obligation 0 0  
Prior service (cost) benefit 63 76  
Net actuarial (loss) gain (348) (416)  
Net amount recognized in equity-pretax (285) (340)  
Accumulated benefit obligation at period end 1,390 1,384  
Qualified | U.S. | Pension Plans      
Change in plan assets      
Funded status of the plans 230 (23)  
Net amount recognized      
Benefit asset 230 0  
Benefit liability 0 (23)  
Net amount recognized on the balance sheet 230 (23)  
Qualified | U.S. | Postretirement Benefit Plans      
Change in plan assets      
Funded status of the plans (228) (347)  
Net amount recognized      
Benefit asset 0 0  
Benefit liability (228) (347)  
Net amount recognized on the balance sheet (228) (347)  
Qualified | Non-U.S. | Pension Plans      
Change in plan assets      
Funded status of the plans (798) (549)  
Net amount recognized      
Benefit asset 741 808  
Benefit liability (1,539) (1,357)  
Net amount recognized on the balance sheet (798) (549)  
Qualified | Non-U.S. | Postretirement Benefit Plans      
Change in plan assets      
Funded status of the plans (244) (257)  
Net amount recognized      
Benefit asset 25 57  
Benefit liability (269) (314)  
Net amount recognized on the balance sheet (244) (257)  
Nonqualified | U.S. | Pension Plans      
Change in plan assets      
Funded status of the plans (736) (713)  
Net amount recognized      
Net amount recognized on the balance sheet (736) (713)  
Nonqualified | U.S. | Postretirement Benefit Plans      
Change in plan assets      
Funded status of the plans 0 0  
Net amount recognized      
Net amount recognized on the balance sheet 0 0  
Nonqualified | Non-U.S. | Pension Plans      
Change in plan assets      
Funded status of the plans 0 0  
Net amount recognized      
Net amount recognized on the balance sheet 0 0  
Nonqualified | Non-U.S. | Postretirement Benefit Plans      
Change in plan assets      
Funded status of the plans 0 0  
Net amount recognized      
Net amount recognized on the balance sheet $ 0 $ 0