Borrowings - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Jul. 31, 2016	Jul. 02, 2016
Line of Credit Facility
Line of Credit Facility, Interest Rate Description		All of the above bank facilities allow for borrowings at LIBOR-based rates plus a spread depending on the credit default swap spread applicable to the Company’s debt, subject to a cap and floor that vary with the Company’s debt rating assigned by Moody’s Investors Service and Standard and Poor’s. The spread above LIBOR can range from 0.23% to 1.63%.
Line of Credit Facility, Maximum Borrowing Capacity		$ 6,000
Letters of Credit Outstanding, Amount		189
Borrowings		8,085
Letter of Credit
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity		$ 800
Minimum
Line of Credit Facility
Variable Spread Above LIBOR		0.23%
Maximum
Line of Credit Facility
Variable Spread Above LIBOR		1.63%
Existing Line of Credit 3
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500
Existing Line Of Credit 1
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity		2,250
U.S. medium-term notes
Line of Credit Facility
Borrowings		$ 2,987
U.S. medium-term notes | Subsequent Event
Line of Credit Facility
Borrowings	$ 2,000