Borrowings - Long-Term Debt (Details) - USD ($)		9 Months Ended
		Jul. 31, 2017	Apr. 01, 2017	Oct. 31, 2016
Debt Instrument [Line Items]
Total	[1]	$ 14,527,000,000		$ 12,168,000,000
Fair value adjustment related to hedged debt		(99,000,000)		103,000,000
Unamortized debt issuance costs		(48,000,000)		(50,000,000)
Less: current portion		(1,221,000,000)		(2,772,000,000)
Face amount			$ 3,500,000,000
Other, including capital lease obligations, at 0.00%-6.05%, due in calendar years 2017-2021
Debt Instrument [Line Items]
Other, including capital lease obligations		213,000,000		300,000,000
Other, including capital lease obligations, at 0.00%-6.05%, due in calendar years 2017-2021 | Financial Services
Debt Instrument [Line Items]
Other, including capital lease obligations		$ 147,000,000		181,000,000
Other, including capital lease obligations, at 0.00%-6.05%, due in calendar years 2017-2021 | Minimum
Debt Instrument [Line Items]
Interest rate		0.00%
Other, including capital lease obligations, at 0.00%-6.05%, due in calendar years 2017-2021 | Maximum
Debt Instrument [Line Items]
Interest rate		6.05%
Senior Notes
Debt Instrument [Line Items]
Face amount			$ 1,500,000,000.0
Senior Notes | $2,250 issued at discount to par at a price of 99.944% in October 2015 at 2.45%, due October 5, 2017, interest payable semi-annually on April 5 and October 5 of each year
Debt Instrument [Line Items]
Total		$ 750,000,000		2,249,000,000
Face amount		$ 2,250,000,000
Discount to par		99.944%
Interest rate		2.45%
Senior Notes | $2,650 issued at discount to par at a price of 99.872% in October 2015 at 2.85%, due October 5, 2018, interest payable semi-annually on April 5 and October 5 of each year
Debt Instrument [Line Items]
Total		$ 2,648,000,000		2,648,000,000
Face amount		$ 2,650,000,000
Discount to par		99.872%
Interest rate		2.85%
Senior Notes | $3,000 issued at discount to par at a price of 99.972% in October 2015 at 3.6%, due October 15, 2020, interest payable semi-annually on April 15 and October 15 of each year
Debt Instrument [Line Items]
Total		$ 2,999,000,000		2,999,000,000
Face amount		$ 3,000,000,000
Discount to par		99.972%
Interest rate		3.60%
Senior Notes | $1,350 issued at discount to par at a price of 99.802% in October 2015 at 4.4%, due October 15, 2022, interest payable semi-annually on April 15 and October 15 of each year
Debt Instrument [Line Items]
Total		$ 1,348,000,000		1,348,000,000
Face amount		$ 1,350,000,000
Discount to par		99.802%
Interest rate		4.40%
Senior Notes | $2,500 issued at discount to par at a price of 99.725% in October 2015 at 4.9%, due October 15, 2025, interest payable semi-annually on April 15 and October 15 of each year
Debt Instrument [Line Items]
Total		$ 2,494,000,000		2,494,000,000
Face amount		$ 2,500,000,000
Discount to par		99.725%
Interest rate		4.90%
Senior Notes | $750 issued at discount to par at a price of 99.942% in October 2015 at 6.2%, due October 15, 2035, interest payable semi-annually on April 15 and October 15 of each year
Debt Instrument [Line Items]
Total		$ 750,000,000		750,000,000
Face amount		$ 750,000,000
Discount to par		99.942%
Interest rate		6.20%
Senior Notes | $1,500 issued at discount to par at a price of 99.932% in October 2015 at 6.35%, due October 15, 2045, interest payable semi-annually on April 15 and October 15 of each year
Debt Instrument [Line Items]
Total		$ 1,499,000,000		1,499,000,000
Face amount		$ 1,500,000,000
Discount to par		99.932%
Interest rate		6.35%
Senior Notes | $350 issued at par in October 2015 at three-month USD LIBOR plus 1.74%, due October 5, 2017, interest payable quarterly on January 5, April 5, July 5 and October 5 of each year
Debt Instrument [Line Items]
Total		$ 350,000,000		350,000,000
Face amount		$ 350,000,000
Senior Notes | $350 issued at par in October 2015 at three-month USD LIBOR plus 1.74%, due October 5, 2017, interest payable quarterly on January 5, April 5, July 5 and October 5 of each year | LIBOR
Debt Instrument [Line Items]
Basis spread		1.74%
Senior Notes | $250 issued at par in October 2015 at three-month USD LIBOR plus 1.93%, due October 5, 2018, interest payable quarterly on January 5, April 5, July 5 and October 5 of each year
Debt Instrument [Line Items]
Total		$ 250,000,000		250,000,000
Face amount		$ 250,000,000
Senior Notes | $250 issued at par in October 2015 at three-month USD LIBOR plus 1.93%, due October 5, 2018, interest payable quarterly on January 5, April 5, July 5 and October 5 of each year | LIBOR
Debt Instrument [Line Items]
Basis spread		1.93%
Senior Notes | $2,600 issued at discount to par at a price of 99.750% in June 2017 at three-month LIBOR plus 2.75%, due June 21, 2024, interest payable quarterly
Debt Instrument [Line Items]
Total		$ 2,594,000,000		$ 0
Face amount		$ 2,600,000,000.0
Discount to par		99.75%
Senior Notes | $2,600 issued at discount to par at a price of 99.750% in June 2017 at three-month LIBOR plus 2.75%, due June 21, 2024, interest payable quarterly | LIBOR
Debt Instrument [Line Items]
Basis spread		2.75%

[1] During the first quarter of fiscal 2017, the Company adopted ASU 2015-03, which simplifies the presentation of debt issuance costs by requiring debt issuance costs to be presented as a deduction from the corresponding debt liability rather than an asset that is amortized. The Company adopted the standard retrospectively for the prior period presented.