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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award        
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 8us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 18us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 17us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, in years     3 years  
Total compensation cost, net of estimated forfeitures, related to unvested awards not yet recognized, pre-tax 33us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  33us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted-average period over which award cost is expected to be recognized (in years)     2 years  
Stock Options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Exercisable period of plans, in years     7 years  
Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Exercisable period of plans, in years     10 years  
Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, in years     3 years  
Total compensation cost, net of estimated forfeitures, related to unvested awards not yet recognized, pre-tax 112us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
  112us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Weighted-average period over which award cost is expected to be recognized (in years)     2 years  
Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, in years     3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     120.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Total compensation cost, net of estimated forfeitures, related to unvested awards not yet recognized, pre-tax $ 21us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
  $ 21us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Weighted-average period over which award cost is expected to be recognized (in years)     2 years  
Performance Share Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     0.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Performance Share Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     200.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember