Commitments and Contingencies - Principal Contractual Commitments Excluding Open Orders for Inventory Purchases That Support Normal Operations (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Operating leases
Three Months Ended December 31, 2013	$ 186
Year Ended December 31, 2014	649
Year Ended December 31, 2015	595
Year Ended December 31, 2016	552
Year Ended December 31, 2017	493
Thereafter	2,424
Total	4,899
Unconditional purchase obligations
Three Months Ended December 31, 2013	32	[1]
Year Ended December 31, 2014	477	[1]
Year Ended December 31, 2015	291	[1]
Year Ended December 31, 2016	63	[1]
Year Ended December 31, 2017	35	[1]
Thereafter	49	[1]
Total	947	[1]
Other commitments
Three Months Ended December 31, 2013	267	[2],[3]
Year Ended December 31, 2014	360	[2],[3]
Year Ended December 31, 2015	245	[2],[3]
Year Ended December 31, 2016	151	[2],[3]
Year Ended December 31, 2017	117	[2],[3]
Thereafter	1,242	[2],[3]
Total	2,382	[2],[3]
Long-term Purchase Commitments [Line Items]
Three Months Ended December 31, 2013	863
Year Ended December 31, 2014	2,938
Year Ended December 31, 2015	2,749
Year Ended December 31, 2016	1,076
Year Ended December 31, 2017	1,787
Thereafter	5,707
Total	15,120
Debt principal and interest
Long-term Purchase Commitments [Line Items]
Three Months Ended December 31, 2013	156
Year Ended December 31, 2014	633
Year Ended December 31, 2015	867
Year Ended December 31, 2016	43
Year Ended December 31, 2017	1,043
Thereafter	1,407
Total	4,149
Capital leases, including interest
Long-term Purchase Commitments [Line Items]
Three Months Ended December 31, 2013	214
Year Ended December 31, 2014	779
Year Ended December 31, 2015	710
Year Ended December 31, 2016	225
Year Ended December 31, 2017	56
Thereafter	115
Total	2,099
Financing lease obligations, including interest
Long-term Purchase Commitments [Line Items]
Three Months Ended December 31, 2013	8
Year Ended December 31, 2014	40
Year Ended December 31, 2015	41
Year Ended December 31, 2016	42
Year Ended December 31, 2017	43
Thereafter	470
Total	$ 644

[1] Includes unconditional purchase obligations related to agreements to acquire and license digital video content that represent long-term liabilities or that are not reflected on the consolidated balance sheets.

[2] Excludes $336 million of tax contingencies for which we cannot make a reasonably reliable estimate of the amount and period of payment, if any.

[3] Includes the estimated timing and amounts of payments for rent and tenant improvements associated with build-to-suit lease arrangements that have not been placed in service.