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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 01, 2017
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Tax Contingency [Line Items]          
Income tax expense   $ 1,614 $ 908 $ 815  
Net discrete tax expense (benefit)   82 42 (33)  
Tax benefit related to adoption of amended accounting guidance   54 0 0  
Non-deductible goodwill impairment   $ 106 0 $ 0  
Discrete tax benefit     $ 25    
Income tax rates   23.40% 27.90% 30.70%  
Goodwill impairment charge   $ 290 $ 0 $ 0  
Net tax benefit on intellectual property transfer   137 0 0  
Tax expense recognized on gain from asset exchange $ 929        
Valuation allowance   503 267    
Increase in valuation allowance   236      
Unrecognized tax benefits   486 555 616 $ 647
Unrecognized tax benefits that would Impact income tax expense and the effective tax rate   342      
Income tax expense (benefit), before any tax effect, related to accrued interest and penalties   (6) 12 (24)  
Accrued interest and penalties on unrecognized tax benefits   45 77    
Undistributed earnings of foreign operations   6,877      
Foreign Tax Authority          
Income Tax Contingency [Line Items]          
Federal, state and foreign net operating loss carryforwards   1,367      
Capital loss carryforwards   624      
IRS          
Income Tax Contingency [Line Items]          
Net discrete tax expense (benefit)     $ 19    
Canada Revenue Agency          
Income Tax Contingency [Line Items]          
Net discrete tax expense (benefit)       $ 55  
Federal          
Income Tax Contingency [Line Items]          
Federal, state and foreign net operating loss carryforwards   126      
State          
Income Tax Contingency [Line Items]          
Federal, state and foreign net operating loss carryforwards   2,099      
Technology Solutions          
Income Tax Contingency [Line Items]          
Goodwill impairment charge   290      
New Accounting Pronouncement, Early Adoption, Effect [Member]          
Income Tax Contingency [Line Items]          
Tax benefit related to adoption of amended accounting guidance   $ 54