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Borrowings (Details) - USD ($)
$ in Millions
Jul. 20, 2015
May. 20, 2015
Bridge Loan [Member]    
Debt Instrument [Line Items]    
Bridge loan   $ 13,000
Loan processing fee   52
Amortization of bridge loan facility fees   $ 36
Subsequent Event [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Proceeds of senior unsecured debt $ 14,800  
Subsequent Event [Member] | Unsecured Debt [Member] | Unsecured Senior Notes 1.900% Due in 2018 [Member]    
Debt Instrument [Line Items]    
Face amount $ 2,250  
Stated interest rate 1.90%  
Subsequent Event [Member] | Unsecured Debt [Member] | Unsecured Senior Notes 2.800% Due in 2020 [Member]    
Debt Instrument [Line Items]    
Face amount $ 2,750  
Stated interest rate 2.80%  
Subsequent Event [Member] | Unsecured Debt [Member] | Unsecured Senior Notes 3.500% Due in 2022 [Member]    
Debt Instrument [Line Items]    
Face amount $ 1,500  
Stated interest rate 3.50%  
Subsequent Event [Member] | Unsecured Debt [Member] | Unsecured Senior Notes 3.875% Due in 2025 [Member]    
Debt Instrument [Line Items]    
Face amount $ 3,000  
Stated interest rate 3.875%  
Subsequent Event [Member] | Unsecured Debt [Member] | Unsecured Senior Notes 4.875% Due in 2035 [Member]    
Debt Instrument [Line Items]    
Face amount $ 2,000  
Stated interest rate 4.875%  
Subsequent Event [Member] | Unsecured Debt [Member] | Unsecured Senior Notes 5.125% Due in 2045 [Member]    
Debt Instrument [Line Items]    
Face amount $ 3,500  
Stated interest rate 5.125%  
Subsequent Event [Member] | Unsecured Debt [Member] | Unsecured Senior Notes 1.900% due in 2018, 2.800% due in 2020, 3.500% due in 2022, 4.875% due in 2035, and 5.125% due in 2045 [Member]    
Debt Instrument [Line Items]    
Redemption price percent 101.00%