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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service Cost $ 5 $ 8 $ 12 $ 13
Interest Cost 91 140 182 281
Expected return on plan assets (228) (249) (458) (500)
Amortization of unrecognized loss (gain) 13 1 27 2
Amortization of Prior Service Benefit (1) (1) (1) (1)
Settlement/Curtailment Loss (Gain) 0 1 1 3
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost (120) (100) (237) (202)
Other Benefit Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service Cost 0 0 0 1
Interest Cost 5 17 11 33
Amortization of unrecognized loss (gain) 24 0 47 0
Amortization of Prior Service Benefit (231) 0 (461) 0
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost (203) 17 (404) 34
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment $ (1) $ 0 $ (1) $ 0