Debt and Financing Costs - Additional Information (Detail) - USD ($)		9 Months Ended
	Sep. 01, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Commercial paper program		$ 3,500,000,000
Commercial paper, committed bank facilities, and uncommitted bank lines outstanding		0		$ 1,570,000,000
Payments of notes		$ 939,000,000
5.625% Notes Due 2017 [Member]
Debt Instrument [Line Items]
Debt before unamortized discount	$ 500,000,000
Notes interest rate	5.625%
Debt maturity year	2017
Payments of notes	$ 939,000,000
Accrued and unpaid interest	8,000,000
1.75% Notes Due 2017 [Member]
Debt Instrument [Line Items]
Debt before unamortized discount	$ 400,000,000
Notes interest rate	1.75%
Debt maturity year	2017
Payments of notes	$ 939,000,000
Accrued and unpaid interest	$ 8,000,000
Five-Year Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving bank facility			$ 3,500,000,000
Credit facility maturity date		Jun. 30, 2020
Five-Year Revolving Credit Facility [Member] | Scenario, Previously Reported [Member]
Debt Instrument [Line Items]
Unsecured credit facility available to company			$ 5,300,000,000
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Period For Borrowing Funds		270 days