Financial Instruments - Balance Sheet Grouping - Footnotes (Detail) - USD ($) $ in Millions		Oct. 01, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		$ 22,815	$ 24,175
Selected financial liabilities		45,124	43,750
Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets	[1]	288	567
Other Current Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		97	26
Other Current Assets [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		86	43
Other Current Assets [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		105	497
Other Noncurrent Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets	[2]	543	689
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		532	599
Other Noncurrent Assets [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		6	36
Other Noncurrent Assets [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial assets		5	54
Other Current Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities	[3]	277	443
Other Current Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		1	1
Other Current Liabilities [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities			300
Other Current Liabilities [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		276	143
Other Noncurrent Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities	[4]	896	1,222
Other Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		153	147
Other Noncurrent Liabilities [Member] | Foreign Currency Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		710	$ 1,100
Other Noncurrent Liabilities [Member] | Foreign Currency Forward-Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Selected financial liabilities		$ 33

[1] As of October 1, 2017, derivative instruments at fair value include interest rate swaps ($97 million), foreign currency swaps ($86 million) and foreign currency forward-exchange contracts ($105 million) and, as of December 31, 2016, include interest rate swaps ($26 million), foreign currency swaps ($43 million) and foreign currency forward-exchange contracts ($497 million).

[2] As of October 1, 2017, derivative instruments at fair value include interest rate swaps ($532 million), foreign currency swaps ($6 million) and foreign currency forward-exchange contracts ($5 million) and, as of December 31, 2016, include interest rate swaps ($599 million), foreign currency swaps ($36 million) and foreign currency forward-exchange contracts ($54 million).

[3] As of October 1, 2017, derivative instruments at fair value include foreign currency forward-exchange contracts ($276 million) and interest rate swaps ($1 million) and, as of December 31, 2016, include interest rate swaps ($1 million), foreign currency swaps ($300 million) and foreign currency forward-exchange contracts ($143 million).

[4] As of October 1, 2017, derivative instruments at fair value include interest rate swaps ($153 million), foreign currency swaps ($710 million) and foreign currency forward-exchange contracts ($33 million) and, as of December 31, 2016, include interest rate swaps ($147 million) and foreign currency swaps ($1.1 billion).