Fair Value Measurements and Investments (Tables)

9 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Fair Value Measurements Using Inputs Considered as
	Level 1				Level 2				Level 3
	June 30, 2016		September 30, 2015		June 30, 2016		September 30, 2015		June 30, 2016		September 30, 2015
	(in millions)
Assets
Cash equivalents and restricted cash:
Money market funds	$	4,712	$	3,051
U.S. government-sponsored debt securities					$	80	$	280
Investment securities, trading:
Equity securities	69		66
Investment securities, available-for-sale:
U.S. Treasury securities	2,407		2,656
U.S. government-sponsored debt securities					3,836		2,615
Equity securities	41		4
Corporate debt securities					273		533
Auction rate securities									$	—	$	7
Prepaid and other current assets:
Foreign exchange derivative instruments					163		76
Other assets:
Foreign exchange derivative instruments					5		—
Total	$	7,229	$	5,777	$	4,357	$	3,504	$	—	$	7
Liabilities
Accrued liabilities:
Visa Europe put option									$	—	$	255
Foreign exchange derivative instruments					$	258	$	13
Other liabilities:
Foreign exchange derivative instruments					17		—
Total	$	—	$	—	$	275	$	13	$	—	$	255

Schedule of Long-term Debt Instruments

The following table presents the carrying amount and estimated fair value of the Company’s debt in order of maturity:

	June 30, 2016
	Carrying Amount		Estimated Fair Value
	(in millions)
1.20% Senior Notes due December 2017	$	1,746	$	1,761
2.20% Senior Notes due December 2020	2,987		3,093
2.80% Senior Notes due December 2022	2,237		2,375
3.15% Senior Notes due December 2025	3,963		4,276
4.15% Senior Notes due December 2035	1,485		1,696
4.30% Senior Notes due December 2045	3,461		4,052
	$	15,879	$	17,253