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