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Restructuring Costs - Restructuring Liability (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Reserve [Roll Forward]        
Costs Expensed, Net of Reversals $ 145 $ 265 $ 212 $ 337
Restructuring Liability, ending balance 235   235  
Fiscal 2022 Plan        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     0  
Costs Expensed, Net of Reversals     213  
Costs Not Affecting Restructuring Liability     (36)  
Cash Paid     (63)  
Other     (2)  
Restructuring Liability, ending balance 112   112  
Fiscal 2022 Plan | Workforce Reductions        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     0  
Costs Expensed, Net of Reversals     163  
Costs Not Affecting Restructuring Liability     (1)  
Cash Paid     (51)  
Other     (2)  
Restructuring Liability, ending balance 109   109  
Fiscal 2022 Plan | Facilities Costs        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     0  
Costs Expensed, Net of Reversals     50  
Costs Not Affecting Restructuring Liability     (35)  
Cash Paid     (12)  
Other     0  
Restructuring Liability, ending balance 3   3  
Fiscal 2021 Plan        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     183  
Costs Expensed, Net of Reversals     2  
Costs Not Affecting Restructuring Liability     (5)  
Cash Paid     (106)  
Other     (1)  
Restructuring Liability, ending balance 73   73  
Fiscal 2021 Plan | Workforce Reductions        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     180  
Costs Expensed, Net of Reversals     (3)  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (105)  
Other     (1)  
Restructuring Liability, ending balance 71   71  
Fiscal 2021 Plan | Facilities Costs        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     3  
Costs Expensed, Net of Reversals     5  
Costs Not Affecting Restructuring Liability     (5)  
Cash Paid     (1)  
Other     0  
Restructuring Liability, ending balance 2   2  
Fiscal 2020 Plan        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     27  
Costs Expensed, Net of Reversals     (2)  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (10)  
Other     0  
Restructuring Liability, ending balance 15   15  
Fiscal 2020 Plan | Workforce Reductions        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     27  
Costs Expensed, Net of Reversals     (2)  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (10)  
Other     0  
Restructuring Liability, ending balance 15   15  
Fiscal 2020 Plan | Facilities Costs        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     0  
Costs Expensed, Net of Reversals     0  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     0  
Other     0  
Restructuring Liability, ending balance 0   0  
Other Prior Year Plans        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     25  
Costs Expensed, Net of Reversals     1  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (16)  
Other     0  
Restructuring Liability, ending balance 10   10  
Other Prior Year Plans | Workforce Reductions        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     19  
Costs Expensed, Net of Reversals     1  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (13)  
Other     0  
Restructuring Liability, ending balance 7   7  
Other Prior Year Plans | Facilities Costs        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     6  
Costs Expensed, Net of Reversals     0  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (3)  
Other     0  
Restructuring Liability, ending balance 3   3  
Acquired Liabilities        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     35  
Costs Expensed, Net of Reversals     (2)  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (6)  
Other     (2)  
Restructuring Liability, ending balance 25   25  
Acquired Liabilities | Workforce Reductions        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     34  
Costs Expensed, Net of Reversals     (2)  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (5)  
Other     (2)  
Restructuring Liability, ending balance 25   25  
Acquired Liabilities | Facilities Costs        
Restructuring Reserve [Roll Forward]        
Restructuring Liability, beginning balance     1  
Costs Expensed, Net of Reversals     0  
Costs Not Affecting Restructuring Liability     0  
Cash Paid     (1)  
Other     0  
Restructuring Liability, ending balance $ 0   $ 0