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RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure      
Percentage of the significant plans over global pension and postretirement liabilities, which utilize quarterly measurement policy 90.00%    
Pension Plans      
Amounts that will be amortized from accumulated other comprehensive income (loss) into net expense in next fiscal year      
Future amortization of gain (loss) $ 233    
Future amortization of prior service cost (credit) (2)    
U.S. Pension Plans      
Defined Benefit Plan, Net Periodic Benefit Cost      
Expected return on plan assets (886) $ (893) $ (878)
Amortization of unrecognized      
Total net (benefit) expense (150) (143) (184)
U.S. Qualified Pension Plan      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 3 4 6
Interest cost on benefit obligation 520 553 541
Expected return on plan assets (886) (893) (878)
Amortization of unrecognized      
Prior service (benefit) cost 0 (3) (3)
Net actuarial loss 160 139 105
Curtailment loss (gain) 13 14 0
Settlement loss (gain) 0 0 0
Special termination benefits 0 0 0
Total net (benefit) expense (190) (186) (229)
U.S. Nonqualified Pension Plan      
Amortization of unrecognized      
Total net (benefit) expense 40 43 45
Non-U.S. Pension Plans      
Defined Benefit Plan, Net Periodic Benefit Cost      
Expected return on plan assets (287) (323) (384)
Amortization of unrecognized      
Total net (benefit) expense 221 281 324
Non-U.S. Qualified Pension Plan      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 154 168 178
Interest cost on benefit obligation 282 317 376
Expected return on plan assets (287) (323) (384)
Amortization of unrecognized      
Prior service (benefit) cost (1) 2 1
Net actuarial loss 69 73 77
Curtailment loss (gain) (2) 0 14
Settlement loss (gain) 6 44 53
Special termination benefits 0 0 9
Total net (benefit) expense 221 281 324
Non-U.S. Nonqualified Pension Plan      
Amortization of unrecognized      
Total net (benefit) expense 0 0 0
Postretirement Benefit Plans      
Amounts that will be amortized from accumulated other comprehensive income (loss) into net expense in next fiscal year      
Future amortization of gain (loss) 28    
Future amortization of prior service cost (credit) (9)    
U.S. Postretirement Benefit Plans      
Amortization of unrecognized      
Total net (benefit) expense 15 30 32
U.S. Qualified Postretirement Benefit Plan      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 0 0 0
Interest cost on benefit obligation 25 33 33
Expected return on plan assets (9) (3) (1)
Amortization of unrecognized      
Prior service (benefit) cost 0 0 0
Net actuarial loss (1) 0 0
Curtailment loss (gain) 0 0 0
Settlement loss (gain) 0 0 0
Special termination benefits 0 0 0
Total net (benefit) expense 15 30 32
U.S. Nonqualified Postretirement Benefit Plan      
Amortization of unrecognized      
Total net (benefit) expense 0 0 0
Non-U.S. Postretirement Benefit Plans      
Amortization of unrecognized      
Total net (benefit) expense 38 46 41
Non-U.S. Qualified Postretirement Benefit Plan      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 10 12 15
Interest cost on benefit obligation 94 108 120
Expected return on plan assets (86) (105) (121)
Amortization of unrecognized      
Prior service (benefit) cost (10) (11) (12)
Net actuarial loss 30 43 39
Curtailment loss (gain) 0 (1) 0
Settlement loss (gain) 0 0 0
Special termination benefits 0 0 0
Total net (benefit) expense 38 46 41
Non-U.S. Nonqualified Postretirement Benefit Plan      
Amortization of unrecognized      
Total net (benefit) expense $ 0 $ 0 $ 0