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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 01, 2019
May 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Defined Benefit Plan, Unfunded Status         $ 5,800    
Restricted Cash         $ 319    
Discount rate           3.64% 4.23%
Defined Benefit Plan Remeasurement Impact Underfunded Status   $ 114        
Defined Benefit Plan, Employer Contribution Amount   $ 1,100          
Pension Plan              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Service Cost 5 31 37 $ 103      
Interest Cost 185 186 592 567      
Expected return on plan assets (253) (300) (839) (907)      
Amortization of unrecognized (gain) loss 0 (1) 2 (5)      
Curtailment/settlement loss (gain) 1 2 0 (2)      
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost (62) (82) (208) (244)      
Other Benefit Plans              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Service Cost 0 3 3 7      
Interest Cost 20 20 65 63      
Amortization of unrecognized (gain) loss 0 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] 0 (13) (17) (38)      
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax 0 (26) (37) (80)      
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) (69) (191) (206)      
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 $ 20 $ 23 $ 67 $ 70      
[1]
Includes non-service related components of net periodic benefit credit of $(37) million for the nine months ended September 30, 2019, $(26) million for the three months ended September 30, 2018, and $(80) million for the nine months ended September 30, 2018, respectively (none for the three months ended September 30, 2019).