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Strategic Initiatives (Details) - 2-year Restructuring Plan [Member] - USD ($)
$ in Millions
12 Months Ended 24 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 280    
Forecast [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected period for completion of restructuring plan   2 years  
Minimum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring charges, pre-tax 520   $ 350
Expected restructuring charges, after-tax     265
Additional expected restructuring charges pre-tax 170    
Additional expected restructuring charges, after-tax 125    
Maximum [Member]      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring charges, pre-tax 590   400
Expected restructuring charges, after-tax     $ 305
Additional expected restructuring charges pre-tax 190    
Additional expected restructuring charges, after-tax $ 145