Strategic Initiatives (Details) - 2-year Restructuring Plan [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended	24 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 84	$ 244
Period of potential delay in implementation of restructuring plan		24 months
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	410	$ 410		$ 350
Expected restructuring charges, after-tax				265
Additional expected restructuring charges pre-tax	60	60
Additional expected restructuring charges, after-tax	45	45
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	480	480		400
Expected restructuring charges, after-tax				$ 305
Additional expected restructuring charges pre-tax	80	80
Additional expected restructuring charges, after-tax	$ 60	$ 60