Financial Instruments by Balance Sheet Grouping - Footnotes (Detail) - USD ($) $ in Millions		Jun. 28, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		$ 47,244	$ 53,627
Selected financial liabilities		37,095	37,371
Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets	[1]	831	1,059
Other Current Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		16	34
Other Current Assets [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		520	494
Other Current Assets [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		294	531
Other Noncurrent Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets	[2]	765	881
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		652	767
Other Noncurrent Assets [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		91	99
Other Noncurrent Assets [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		23	15
Other Current Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities	[3]	858	93
Other Current Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		4	1
Other Current Liabilities [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		589	13
Other Current Liabilities [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		265	78
Other Noncurrent Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities	[4]	1,114	596
Other Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		376	16
Other Noncurrent Liabilities [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		737	$ 581
Other Noncurrent Liabilities [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		$ 1

[1] As of June 28, 2015, derivative instruments at fair value include interest rate swaps ($16 million), foreign currency swaps ($520 million) and foreign currency forward-exchange contracts ($294 million) and, as of December 31, 2014, include interest rate swaps ($34 million), foreign currency swaps ($494 million) and foreign currency forward-exchange contracts ($531 million).

[2] As of June 28, 2015, derivative instruments at fair value include interest rate swaps ($652 million), foreign currency swaps ($91 million) and foreign currency forward-exchange contracts ($23 million) and, as of December 31, 2014, include interest rate swaps ($767 million), foreign currency swaps ($99 million) and foreign currency forward-exchange contracts ($15 million).

[3] As of June 28, 2015, derivative instruments at fair value include interest rate swaps ($4 million), foreign currency swaps ($589 million) and foreign currency forward-exchange contracts ($265 million) and, as of December 31, 2014, include interest rate swaps ($1 million), foreign currency swaps ($13 million) and foreign currency forward-exchange contracts ($78 million).

[4] As of June 28, 2015, derivative instruments at fair value include interest rate swaps ($376 million), foreign currency swaps ($737 million) and foreign currency forward-exchange contracts ($1 million) and, as of December 31, 2014, include interest rate swaps ($16 million) and foreign currency swaps ($581 million).