Financial Instruments - Investments in Debt Securities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 29, 2013		Dec. 31, 2012
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Held-to-maturity debt securities maturities total	$ 1,465	[1],[2]	$ 1,459	[1],[2]
Debt securities maturities within 1 year	31,010
Debt securities maturities over 1 to 5 years	10,944
Debt securities maturities over 5 to 10 years	1,157
Debt securities maturities after 10 years	888
Total debt securities	43,999
Certificates of deposit and other [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Held-to-maturity debt securities maturities within 1 year	1,398
Held-to-maturity debt securities with maturities over 1 to 5 years	67
Held-to-maturity debt securities maturities over 5 to 10 years	0
Held-to-maturity debt securities maturities over 10 years	0
Held-to-maturity debt securities maturities total	1,465
Western European, scandinavian and other government debt [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	20,409	[3]
Available-for-sale debt securities maturities over 1 to 5 years	2,225	[3]
Available-for-sale debt securities maturities over 5 to 10 years	0
Available-for-sale debt securities maturities over 10 years	0	[3]
Available-for-sale debt securities maturities total	22,634	[3]
Corporate debt [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	2,152	[4]
Available-for-sale debt securities maturities over 1 to 5 years	4,479	[4]
Available-for-sale debt securities maturities over 5 to 10 years	1,097
Available-for-sale debt securities maturities over 10 years	348	[4]
Available-for-sale debt securities maturities total	8,076	[4]
Western European, Scandinavian, Australia and other government agency debt [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	2,955	[3]
Available-for-sale debt securities maturities over 1 to 5 years	440	[3]
Available-for-sale debt securities maturities over 5 to 10 years	0
Available-for-sale debt securities maturities over 10 years	0	[3]
Available-for-sale debt securities maturities total	3,395
Reverse repurchase agreements [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	2,270	[5]
Available-for-sale debt securities maturities over 1 to 5 years	0	[4]
Available-for-sale debt securities maturities over 5 to 10 years	0
Available-for-sale debt securities maturities over 10 years	0	[4]
Available-for-sale debt securities maturities total	2,270
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	663
Available-for-sale debt securities maturities over 1 to 5 years	873
Available-for-sale debt securities maturities over 5 to 10 years	11
Available-for-sale debt securities maturities over 10 years	524
Available-for-sale debt securities maturities total	2,071
Supranational debt [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	1,086	[3]
Available-for-sale debt securities maturities over 1 to 5 years	919	[4]
Available-for-sale debt securities maturities over 5 to 10 years	0
Available-for-sale debt securities maturities over 10 years	0	[3]
Available-for-sale debt securities maturities total	2,005
Federal Home Loan Mortgage Corporation and Federal National Mortgage Association asset-backed securities [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	0
Available-for-sale debt securities maturities over 1 to 5 years	1,668
Available-for-sale debt securities maturities over 5 to 10 years	0
Available-for-sale debt securities maturities over 10 years	16
Available-for-sale debt securities maturities total	1,684
U.S. government debt [Member]
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	77
Available-for-sale debt securities maturities over 1 to 5 years	273
Available-for-sale debt securities maturities over 5 to 10 years	49
Available-for-sale debt securities maturities over 10 years	0
Available-for-sale debt securities maturities total	$ 399

[1] Gross unrealized gains and losses are not significant.

[2] The differences between the estimated fair values and carrying values of held-to-maturity debt securities, private equity securities at cost and short-term borrowings not measured at fair value on a recurring basis were not significant as of September 29, 2013 or December 31, 2012. The fair value measurements of our held-to-maturity debt securities and our short-term borrowings are based on Level 2 inputs, using a market approach. The fair value measurements of our private equity securities at cost are based on Level 3 inputs, using a market approach.

[3] All issued by above-investment-grade governments, government agencies or supranational entities, as applicable.

[4] Largely issued by above-investment-grade institutions in the financial services sector.

[5] Involving U.S. and U.K. government securities.