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Benefit Plans (Pension and Postretirement Liabilities Recognized in Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Other assets $ 323 $ 43
Accrued liabilities — employment costs (24) (26)
Long-term employment costs (1,960) (3,514)
Net benefit liability (1,661) (3,497)
Postretirement    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued liabilities — employment costs (9) (8)
Long-term employment costs (189) (190)
Net benefit liability $ (198) $ (198)