Restructuring, Impairment, and Related Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges recognized	$ 158	$ 56
Net restructuring, impairment, and related charges recognized	158	56
International
Restructuring Cost and Reserve [Line Items]
Net restructuring, impairment, and related charges recognized	6	$ 14
Pre-tax charges recorded to-date	63
Minimum | International
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	85
Maximum | International
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	90
Restructuring Plan - Remote Work Transitioning
Restructuring Cost and Reserve [Line Items]
Net restructuring, impairment, and related charges recognized	95
Restructuring Plan - Remote Work Transitioning | Minimum | Restructuring Type, Exit Related Costs, Accelerated Depreciation, Amortization and Asset Impairments
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	180
Restructuring Plan - Remote Work Transitioning | Maximum | Restructuring Type, Exit Related Costs, Accelerated Depreciation, Amortization and Asset Impairments
Restructuring Cost and Reserve [Line Items]
Expected total pre-tax charges	$ 280