Other Long-Term Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Equity Method Investments	$ 1,406	$ 1,328
Non-marketable cost method investments	2,719	3,098
Non-current deferred tax assets	789	907
Loans receivable	543	236
Reverse Repurchase Agreements, Noncurrent	1,849	1,018
Other	1,187	993
Total other long-term assets	7,112	7,159
Machinery and Equipment [Member]
Prepaid Expense Other, Noncurrent	468	347
Other Noncurrent Assets [Member]
Reverse Repurchase Agreements, Noncurrent	$ 0	$ 250