Financial Instruments - Investments in Debt Securities (Detail) $ in Millions	Oct. 01, 2017 USD ($)
Total Debt Securities [Line Items]
Debt securities maturities within one year	$ 12,818
Debt securities maturities over 1 to 5 years	3,694
Debt securities maturities over 5 to 10 years	1,532
Debt securities maturities over 10 years	18
Total debt securities	18,061
Corporate debt [Member]
Total Debt Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	2,741	[1]
Available-for-sale debt securities maturities over 1 to 5 years	2,591	[1]
Available-for-sale debt securities maturities over 5 to 10 years	1,525	[1]
Available-for-sale debt securities maturities over 10 years	17	[1]
Available-for-sale debt securities maturities total	6,874	[1]
Western European, Asian and other government debt [Member]
Total Debt Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	6,071	[2]
Available-for-sale debt securities maturities over 1 to 5 years	268	[2]
Available-for-sale debt securities maturities over 5 to 10 years	0	[2]
Available-for-sale debt securities maturities over 10 years	0	[2]
Available-for-sale debt securities maturities total	6,339	[2]
Western European, Scandinavia and other government agency debt [Member]
Total Debt Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	1,955	[2]
Available-for-sale debt securities maturities over 1 to 5 years	42	[2]
Available-for-sale debt securities maturities over 5 to 10 years	0	[2]
Available-for-sale debt securities maturities over 10 years	0	[2]
Available-for-sale debt securities maturities total	1,998	[2]
Supranational debt [Member]
Total Debt Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	387	[2]
Available-for-sale debt securities maturities over 1 to 5 years	195	[2]
Available-for-sale debt securities maturities over 5 to 10 years	0	[2]
Available-for-sale debt securities maturities over 10 years	0	[2]
Available-for-sale debt securities maturities total	582	[2]
Government National Mortgage Association and other U.S. government guaranteed asset-back securities [Member]
Total Debt Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	42
Available-for-sale debt securities maturities over 1 to 5 years	424
Available-for-sale debt securities maturities over 5 to 10 years	0
Available-for-sale debt securities maturities over 10 years	0
Available-for-sale debt securities maturities total	466
Other asset-backed debt [Member]
Total Debt Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	161	[3]
Available-for-sale debt securities maturities over 1 to 5 years	61	[3]
Available-for-sale debt securities maturities over 5 to 10 years	3	[3]
Available-for-sale debt securities maturities over 10 years	0	[3]
Available-for-sale debt securities maturities total	226	[3]
U.S. government debt [Member]
Total Debt Securities [Line Items]
Available-for-sale debt securities maturities within 1 year	0
Available-for-sale debt securities maturities over 1 to 5 years	112
Available-for-sale debt securities maturities over 5 to 10 years	0
Available-for-sale debt securities maturities over 10 years	0
Available-for-sale debt securities maturities total	112
Time deposits and other [Member]
Total Debt Securities [Line Items]
Held-to-maturity debt securities maturities within 1 year	1,133
Held-to-maturity debt securities with maturities over 1 to 5 years	0
Held-to-maturity debt securities maturities over 5 to 10 years	3
Held-to-maturity debt securities maturities over 10 years	0
Held-to-maturity debt securities maturities total	1,137
Western European government debt [Member]
Total Debt Securities [Line Items]
Held-to-maturity debt securities maturities within 1 year	326	[2]
Held-to-maturity debt securities with maturities over 1 to 5 years	0	[2]
Held-to-maturity debt securities maturities over 5 to 10 years	0	[2]
Held-to-maturity debt securities maturities over 10 years	0	[2]
Held-to-maturity debt securities maturities total	$ 326	[2]

[1] Issued by a diverse group of corporations, with a significant concentration in the technology sector, virtually all of which are investment-grade.

[2] Issued by governments, government agencies or supranational entities, as applicable, all of which are high quality.

[3] Includes receivable-backed, loan-backed, and mortgage-backed securities, all of which are high quality and in senior positions in the capital structure of the security. Receivable-backed securities are collateralized by credit cards receivables, loan-backed securities are collateralized by senior secured obligations of a diverse pool of companies or student loans, and mortgage-backed securities are collateralized by diversified pools of residential and commercial mortgages.