Stock-Based Compensation Plans - Performance Awards Outstanding and their Fair Market Value on Respective Grant Date (Details) - TSR Awards $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) shares
2021 - 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value | $	$ 30
Minimum Shares (in shares)	0
Target Shares (in shares)	1,458,144
Maximum Shares (in shares)	2,916,288
2020 - 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value | $	$ 5
Minimum Shares (in shares)	0
Target Shares (in shares)	641,005
Maximum Shares (in shares)	1,282,010
2019 - 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value | $	$ 16
Minimum Shares (in shares)	0
Target Shares (in shares)	615,477
Maximum Shares (in shares)	1,230,954