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Pension and Other Postretirement Benefits (Components of Pension Expense) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Settlements $ 1,511      
Other Postretirement Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost   $ 1 $ 1 $ 1
Interest cost   4 5 6
Amortization of actuarial loss   4 4 3
Amortization of prior service cost   (26) (26) (34)
Net periodic cost   (17) (16) (24)
U.S. Plans | Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost   20 18 15
Interest cost   25 38 50
Expected return on plan assets   (63) (73) (70)
Settlements   0 3 0
Curtailments   9 0 0
Amortization of actuarial loss   58 56 55
Amortization of prior service cost   1 1 1
Net periodic cost   50 43 51
Non-U.S. Plans | Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost   13 10 13
Interest cost   32 52 70
Expected return on plan assets   (72) (107) (138)
Settlements   1,511 63 44
Curtailments   0 0 (14)
Amortization of actuarial loss   33 27 37
Amortization of prior service cost   0 0 (1)
Net periodic cost   $ 1,517 $ 45 $ 11