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Borrowings (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 30, 2016
Jul. 25, 2015
Debt Instrument [Line Items]    
Total $ 28,400 $ 25,251
Unaccreted discount/issuance costs (137) (131)
Hedge accounting fair value adjustments 379 231
Total 28,642 25,351
Current portion of long-term debt 4,159 3,894
Long-term debt $ 24,483 $ 21,457
Floating Rate Notes 3-month Libor Plus 0.05% Due September 2015    
Debt Instrument [Line Items]    
Maturity Date Sep. 03, 2015 Sep. 03, 2015
Notes $ 0 $ 850
Three-month LIBOR plus indicated % 0.00% 0.05%
Effective Rate 0.00% 0.43%
Floating Rate Notes 3-month Libor Plus 0.28% Due March 2017 [Member]    
Debt Instrument [Line Items]    
Maturity Date Mar. 03, 2017 Mar. 03, 2017
Notes $ 1,000 $ 1,000
Three-month LIBOR plus indicated % 0.28% 0.28%
Effective Rate 1.03% 0.63%
Floating Rate Notes 3-month Libor Plus 0.60% Due February 2018 [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 21, 2018  
Notes $ 1,000 $ 0
Three-month LIBOR plus indicated % 0.60% 0.00%
Effective Rate 1.32% 0.00%
Floating Rate Notes 3-month Libor Plus 0.31% Due June 2018 [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 15, 2018 Jun. 15, 2018
Notes $ 900 [1] $ 900
Three-month LIBOR plus indicated % 0.31% 0.31%
Effective Rate 1.03% 0.65%
Floating rate notes 3-month Libor plus 0.5% due March 2019 [Member]    
Debt Instrument [Line Items]    
Maturity Date Mar. 01, 2019 Mar. 01, 2019
Notes $ 500 $ 500
Three-month LIBOR plus indicated % 0.50% 0.50%
Effective Rate 1.23% 0.84%
Fixed-Rate Notes, 5.5%, Due February 2016    
Debt Instrument [Line Items]    
Maturity Date Feb. 22, 2016 Feb. 22, 2016
Notes $ 0 $ 3,000
Debt Instrument, Interest Rate, Stated Percentage 5.50% 5.50%
Effective Rate 0.00% 3.07%
Fixed-Rate Notes, 1.1%, Due March 2017    
Debt Instrument [Line Items]    
Maturity Date Mar. 03, 2017 Mar. 03, 2017
Notes $ 2,400 $ 2,400
Debt Instrument, Interest Rate, Stated Percentage 1.10% 1.10%
Effective Rate 0.87% 0.59%
Fixed-Rate Notes, 3.15%, Due March 2017    
Debt Instrument [Line Items]    
Maturity Date Mar. 14, 2017 Mar. 14, 2017
Notes $ 750 $ 750
Debt Instrument, Interest Rate, Stated Percentage 3.15% 3.15%
Effective Rate 1.22% 0.85%
Fixed Rate Notes, 1.4%, Due February 28, 2018 [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 28, 2018  
Notes $ 1,250 $ 0
Debt Instrument, Interest Rate, Stated Percentage 1.40% 0.00%
Effective Rate 1.47% 0.00%
Fixed rate notes 1.65% due June 2018 [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 15, 2018 Jun. 15, 2018
Notes $ 1,600 [1] $ 1,600
Debt Instrument, Interest Rate, Stated Percentage 1.65% 1.65%
Effective Rate 1.72% 1.72%
Fixed-Rate Notes, 4.95%, Due February 2019    
Debt Instrument [Line Items]    
Maturity Date Feb. 15, 2019 Feb. 15, 2019
Notes $ 2,000 $ 2,000
Debt Instrument, Interest Rate, Stated Percentage 4.95% 4.95%
Effective Rate 4.76% 4.70%
Fixed-Rate Notes, 1.60%, Due February 2019 [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 28, 2019  
Notes $ 1,000 $ 0
Debt Instrument, Interest Rate, Stated Percentage 1.60% 0.00%
Effective Rate 1.67% 0.00%
Fixed-Rate Notes, 2.125%, Due March 2019    
Debt Instrument [Line Items]    
Maturity Date Mar. 01, 2019 Mar. 01, 2019
Notes $ 1,750 $ 1,750
Debt Instrument, Interest Rate, Stated Percentage 2.125% 2.125%
Effective Rate 1.08% 0.80%
Fixed-Rate Notes, 4.45%, Due January 2020    
Debt Instrument [Line Items]    
Maturity Date Jan. 15, 2020 Jan. 15, 2020
Notes $ 2,500 $ 2,500
Debt Instrument, Interest Rate, Stated Percentage 4.45% 4.45%
Effective Rate 3.25% 3.01%
Fixed-Rate Notes, 2.45%, Due June 2020 [Member] [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 15, 2020 Jun. 15, 2020
Notes $ 1,500 [1] $ 1,500
Debt Instrument, Interest Rate, Stated Percentage 2.45% 2.45%
Effective Rate 2.54% 2.54%
Fixed-Rate Notes, 2.2%, Due February 2021 [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 28, 2021  
Notes $ 2,500 $ 0
Debt Instrument, Interest Rate, Stated Percentage 2.20% 0.00%
Effective Rate 2.30% 0.00%
Fixed-Rate Notes, 2.90%, Due March 2021    
Debt Instrument [Line Items]    
Maturity Date Mar. 04, 2021 Mar. 04, 2021
Notes $ 500 $ 500
Debt Instrument, Interest Rate, Stated Percentage 2.90% 2.90%
Effective Rate 1.24% 0.96%
Fixed-Rate Notes, 3.0 %, Due June 15, 2022 [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 15, 2022 Jun. 15, 2022
Notes $ 500 [1] $ 500
Debt Instrument, Interest Rate, Stated Percentage 3.00% 3.00%
Effective Rate 1.51% 1.21%
Fixed-Rate Notes, 2.6%, Due February, 2023 [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 28, 2023  
Notes $ 500 $ 0
Debt Instrument, Interest Rate, Stated Percentage 2.60% 0.00%
Effective Rate 2.68% 0.00%
Fixed-Rate Notes,3.625%, Due March 2024    
Debt Instrument [Line Items]    
Maturity Date Mar. 04, 2024 Mar. 04, 2024
Notes $ 1,000 $ 1,000
Debt Instrument, Interest Rate, Stated Percentage 3.625% 3.625%
Effective Rate 1.36% 1.08%
Fixed-Rate Notes,3.5%, Due June 15, 2025 [Member]    
Debt Instrument [Line Items]    
Maturity Date Jun. 15, 2025 Jun. 15, 2025
Notes $ 500 [1] $ 500
Debt Instrument, Interest Rate, Stated Percentage 3.50% 3.50%
Effective Rate 1.67% 1.37%
Fixed-Rate Notes,2.95%, Due February, 2026 [Member]    
Debt Instrument [Line Items]    
Maturity Date Feb. 28, 2026  
Notes $ 750 $ 0
Debt Instrument, Interest Rate, Stated Percentage 2.95% 0.00%
Effective Rate 3.01% 0.00%
Fixed-Rate Notes, 5.9%, Due February 2039    
Debt Instrument [Line Items]    
Maturity Date Feb. 15, 2039 Feb. 15, 2039
Notes $ 2,000 $ 2,000
Debt Instrument, Interest Rate, Stated Percentage 5.90% 5.90%
Effective Rate 6.11% 6.11%
Fixed-Rate Notes, 5.5%, Due January 2040    
Debt Instrument [Line Items]    
Maturity Date Jan. 15, 2040 Jan. 15, 2040
Notes $ 2,000 $ 2,000
Debt Instrument, Interest Rate, Stated Percentage 5.50% 5.50%
Effective Rate 5.67% 5.67%
Other long-term debt    
Debt Instrument [Line Items]    
Effective Rate 0.00% 2.08%
Other long-term debt $ 0 $ 1
[1] In February 2016, the Company issued senior notes for an aggregate principal amount of $7.0 billion.