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Equity Method Investments, Equity Method Investments (Details) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2015
Dec. 31, 2014
Aug. 31, 2014
Jun. 18, 2012
Schedule of Equity Method Investments [Line Items]        
Carrying Value 0us-gaap_EquityMethodInvestments   $ 7,336us-gaap_EquityMethodInvestments  
Equity method investment ownership interest percentage (in hundredths) 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage      
Alliance Boots [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value     7,336us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsMember		  
Equity method investment ownership interest percentage (in hundredths) 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsMember		 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsMember		 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsMember		 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsMember
Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value 762us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_OtherEquityMethodInvestmentsMember		   74us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_OtherEquityMethodInvestmentsMember		  
Other [Member] | Minimum [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment ownership interest percentage (in hundredths) 12.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_OtherEquityMethodInvestmentsMember		   30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_OtherEquityMethodInvestmentsMember		  
Other [Member] | Maximum [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment ownership interest percentage (in hundredths) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_OtherEquityMethodInvestmentsMember		   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_OtherEquityMethodInvestmentsMember		  
Total [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value 762us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsAndOtherEquityMethodInvestmentsMember		   $ 7,410us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsAndOtherEquityMethodInvestmentsMember