Borrowings - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2016	Jan. 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		187
Proceeds from Issuance of Debt		2,389
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%
Medium-term Notes
Line of Credit Facility
Proceeds from Issuance of Debt		$ 0
Medium-term Notes | Subsequent Event
Line of Credit Facility
Proceeds from Issuance of Debt	$ 3,000