Restructuring Costs - Summary of Total Restructuring Costs (Details) - Transformation Program [Member] - USD ($) $ in Millions	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		$ 88
Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 49		$ 19
Real Estate Rationalization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		68
Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	12		5
Technology Modernization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		17
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		82
Corporate, Non-Segment | Real Estate Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Total	49		19
Corporate, Non-Segment | Real Estate Rationalization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		68
Corporate, Non-Segment | Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total	12
Corporate, Non-Segment | Technology Modernization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		12
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		5
R&B [Member] | Technology Modernization [Member]
Restructuring Cost and Reserve [Line Items]
Total			$ 5
R&B [Member] | Technology Modernization [Member] | Total Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total		$ 5