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Borrowings (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 29, 2017
Mar. 31, 2017
Sep. 30, 2016
Jul. 30, 2016
Debt Instrument [Line Items]        
Total $ 30,500     $ 28,400
Unaccreted discount/issuance costs (136)     (137)
Hedge accounting fair value adjustments 108     379
Total 30,472     28,642
Current portion of long-term debt 4,747     4,159
Long-term debt 25,725     24,483
Aggregate Debt Due In March 2017        
Debt Instrument [Line Items]        
Notes   $ 4,150    
Aggregate Debt Issuance In September 2016        
Debt Instrument [Line Items]        
Notes     $ 6,250  
Three-month LIBOR plus 0.28%        
Debt Instrument [Line Items]        
Notes $ 0     $ 1,000
Effective Rate 0.00%     1.03%
Three-month LIBOR plus 0.60%        
Debt Instrument [Line Items]        
Notes $ 1,000     $ 1,000
Effective Rate 1.84%     1.32%
Three-month LIBOR plus 0.31%        
Debt Instrument [Line Items]        
Notes $ 900     $ 900
Effective Rate 1.62%     1.03%
Three-month LIBOR plus 0.50%        
Debt Instrument [Line Items]        
Notes $ 500     $ 500
Effective Rate 1.76%     1.23%
Three-month LIBOR plus 0.34%        
Debt Instrument [Line Items]        
Notes $ 500     $ 0
Effective Rate 1.66%     0.00%
Fixed-Rate Notes, 1.1%, Due March 2017        
Debt Instrument [Line Items]        
Interest rate, stated percentage 1.10%      
Notes $ 0     $ 2,400
Effective Rate 0.00%     0.87%
Fixed-Rate Notes, 3.15%, Due March 2017        
Debt Instrument [Line Items]        
Interest rate, stated percentage 3.15%      
Notes $ 0     $ 750
Effective Rate 0.00%     1.22%
Fixed Rate Notes, 1.4%, Due February 28, 2018        
Debt Instrument [Line Items]        
Interest rate, stated percentage 1.40%      
Notes $ 1,250     $ 1,250
Effective Rate 1.47%     1.47%
Fixed Rate Notes 1.65% Due June 2018        
Debt Instrument [Line Items]        
Interest rate, stated percentage 1.65%      
Notes $ 1,600     $ 1,600
Effective Rate 1.72%     1.72%
Fixed-Rate Notes, 4.95%, Due February 2019        
Debt Instrument [Line Items]        
Interest rate, stated percentage 4.95%      
Notes $ 2,000     $ 2,000
Effective Rate 4.96%     4.76%
Fixed-Rate Notes, 1.60%, Due February 2019        
Debt Instrument [Line Items]        
Interest rate, stated percentage 1.60%      
Notes $ 1,000     $ 1,000
Effective Rate 1.67%     1.67%
Fixed-Rate Notes, 2.125%, Due March 2019        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.125%      
Notes $ 1,750     $ 1,750
Effective Rate 1.84%     1.08%
FIxed Rate Notes 1.40% Due September 2019        
Debt Instrument [Line Items]        
Interest rate, stated percentage 1.40%      
Notes $ 1,500     $ 0
Effective Rate 1.48%     0.00%
Fixed-Rate Notes, 4.45%, Due January 2020        
Debt Instrument [Line Items]        
Interest rate, stated percentage 4.45%      
Notes $ 2,500     $ 2,500
Effective Rate 3.84%     3.25%
Fixed-Rate Notes, 2.45%, Due June 2020        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.45%      
Notes $ 1,500     $ 1,500
Effective Rate 2.54%     2.54%
Fixed-Rate Notes, 2.2%, Due February 2021        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.20%      
Notes $ 2,500     $ 2,500
Effective Rate 2.30%     2.30%
Fixed-Rate Notes, 2.90%, Due March 2021        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.90%      
Notes $ 500     $ 500
Effective Rate 2.00%     1.24%
Fixed Rate Notes, 1.85% Due September 2021        
Debt Instrument [Line Items]        
Interest rate, stated percentage 1.85%      
Notes $ 2,000     $ 0
Effective Rate 1.90%     0.00%
Fixed-Rate Notes, 3.0 %, Due June 15, 2022        
Debt Instrument [Line Items]        
Interest rate, stated percentage 3.00%      
Notes $ 500     $ 500
Effective Rate 2.26%     1.51%
Fixed-Rate Notes, 2.6%, Due February, 2023        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.60%      
Notes $ 500     $ 500
Effective Rate 2.68%     2.68%
Fixed Rate Notes 2.20%, Due September 2023        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.20%      
Notes $ 750     $ 0
Effective Rate 2.27%     0.00%
Fixed-Rate Notes,3.625%, Due March 2024        
Debt Instrument [Line Items]        
Interest rate, stated percentage 3.625%      
Notes $ 1,000     $ 1,000
Effective Rate 2.12%     1.36%
Fixed-Rate Notes,3.5%, Due June 15, 2025        
Debt Instrument [Line Items]        
Interest rate, stated percentage 3.50%      
Notes $ 500     $ 500
Effective Rate 2.43%     1.67%
Fixed-Rate Notes,2.95%, Due February, 2026        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.95%      
Notes $ 750     $ 750
Effective Rate 3.01%     3.01%
Fixed Rate Notes 2.50%, Due September 2026        
Debt Instrument [Line Items]        
Interest rate, stated percentage 2.50%      
Notes $ 1,500     $ 0
Effective Rate 2.55%     0.00%
Fixed-Rate Notes, 5.9%, Due February 2039        
Debt Instrument [Line Items]        
Interest rate, stated percentage 5.90%      
Notes $ 2,000     $ 2,000
Effective Rate 6.11%     6.11%
Fixed-Rate Notes, 5.5%, Due January 2040        
Debt Instrument [Line Items]        
Interest rate, stated percentage 5.50%      
Notes $ 2,000     $ 2,000
Effective Rate 5.67%     5.67%
LIBOR | Three-month LIBOR plus 0.28%        
Debt Instrument [Line Items]        
Three-month LIBOR plus this percentage 0.28%      
LIBOR | Three-month LIBOR plus 0.60%        
Debt Instrument [Line Items]        
Three-month LIBOR plus this percentage 0.60%      
LIBOR | Three-month LIBOR plus 0.31%        
Debt Instrument [Line Items]        
Three-month LIBOR plus this percentage 0.31%      
LIBOR | Three-month LIBOR plus 0.50%        
Debt Instrument [Line Items]        
Three-month LIBOR plus this percentage 0.50%      
LIBOR | Three-month LIBOR plus 0.34%        
Debt Instrument [Line Items]        
Three-month LIBOR plus this percentage 0.34%