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Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
May 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined Benefit Plan, Funded Status $ 5,800   $ 5,800      
Restricted Cash 319   319      
Discount rate         3.64% 4.23%
Defined Benefit Plan Remeasurement Impact Underfunded Status 114   114      
Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Service Cost 12 $ 36 32 $ 72    
Interest Cost 199 190 407 381    
Expected return on plan assets (282) (302) (586) (607)    
Amortization of unrecognized loss (gain) 1 (3) 2 (4)    
Curtailment/settlement (gain) loss (1) (4) (1) (4)    
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost (71) (83) (146) (162)    
Other Benefit Plans            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Service Cost 1 2 3 4    
Interest Cost 22 22 45 43    
Amortization of unrecognized loss (gain) (1) 0 (1) 0    
Discontinued Operations [Member] | Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost [1] (9) (13) (17) (25)    
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax (16) (27) (37) (54)    
Continuing Operations [Member] | Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost (62) (70) (129) (137)    
Continuing Operations [Member] | Other Benefit Plans            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost $ 22 $ 24 $ 47 $ 47    
[1]
Includes non-service related components of net periodic benefit credit of $(16) million and $(37) million for the three and six months ended June 30, 2019, and $(27) million and $(54) million for the three and six months ended June 30, 2018, respectively.