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