Restructuring Costs - Summary of Total Restructuring Costs (Details) - Transformation Program [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		$ 97
Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 53		$ 19
Real Estate Rationalization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		72
Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	17		5
Technology Modernization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		22
Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Total	1
Process optimization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		1
Other [Member]
Restructuring Cost and Reserve [Line Items]
Total			2
Other [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		2
Corporate, Non-Segment | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		90
Corporate, Non-Segment | Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	53		19
Corporate, Non-Segment | Real Estate Rationalization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		72
Corporate, Non-Segment | Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	16
Corporate, Non-Segment | Technology Modernization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		16
Corporate, Non-Segment | Other [Member]
Restructuring Cost and Reserve [Line Items]
Total			2
Corporate, Non-Segment | Other [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		2
HWC [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		1
HWC [Member] | Process optimization [Member]
Restructuring Cost and Reserve [Line Items]
Total	1
HWC [Member] | Process optimization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		1
R&B [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		6
R&B [Member] | Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 1		$ 5
R&B [Member] | Technology Modernization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		$ 6