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Retirement Plans (Projected Future Pension Benefit Payments, Excluding Any Termination Beneftis) (Details) - U.S. Plans
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Benefit Payments, year 1 $ 569
Benefit Payments, year 2 579
Benefit Payments, year 3 593
Benefit Payments, year 4 607
Benefit Payments, year 5 619
Benefit Payments, year 6-10 $ 3,217