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Subsequent Event (Details) - USD ($)
$ in Millions
24 Months Ended
Dec. 31, 2021
Dec. 31, 2019
2020 - 2021 Restructuring Plan [Member] | Forecast [Member]    
Subsequent Event [Line Items]    
Expected period for completion of restructuring plan 2 years  
Investment in Modernization, Digital Capabilities and Expanded Product Solutions [Member]    
Subsequent Event [Line Items]    
Expected restructuring charges, pre-tax   $ 100
Investment in Modernization, Digital Capabilities and Expanded Product Solutions [Member] | Forecast [Member]    
Subsequent Event [Line Items]    
Expected period for completion of restructuring plan 24 months  
Minimum [Member] | 2020 - 2021 Restructuring Plan [Member]    
Subsequent Event [Line Items]    
Expected restructuring charges, pre-tax   350
Expected restructuring charges, after-tax   265
Maximum [Member] | 2020 - 2021 Restructuring Plan [Member]    
Subsequent Event [Line Items]    
Expected restructuring charges, pre-tax   400
Expected restructuring charges, after-tax   305
Lease Impairment Charges [Member] | Minimum [Member] | 2020 - 2021 Restructuring Plan [Member]    
Subsequent Event [Line Items]    
Expected restructuring charges, pre-tax   200
Lease Impairment Charges [Member] | Maximum [Member] | 2020 - 2021 Restructuring Plan [Member]    
Subsequent Event [Line Items]    
Expected restructuring charges, pre-tax   $ 250