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Postretirement Benefit Plans (Rollforward of Fair Value Measurements) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning Balance $ 679  
Ending Balance 246 $ 679
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning Balance 368 384
Purchases, sales, settlements (210) (8)
Actual return on plan assets (99) (6)
Impact on currency (39) (2)
Ending Balance $ 20 $ 368