Fair Value Measurements - Summary of Derivative Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	$ 262	$ 62	$ 37	$ (8)
Other (income) expense
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	0	0	0	0
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	1,100		1,100		$ 1,100
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Collateral Already Posted, Aggregate Fair Value	153		153
Derivative, Notional Amount	38,800		38,800		34,500
Cross currency interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	7,300		7,300		$ 2,300
Fair Value Hedging | Interest Rate Contract [Member] | Sales to customers
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Interest Rate Contract [Member] | Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Interest Rate Contract [Member] | Research and Development Expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Interest Rate Contract [Member] | Investment Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments				(6)
Fair Value Hedging | Interest Rate Contract [Member] | Other (income) expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Interest Rate Contract [Member] | Interest (income)/Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(7)	(4)	3
Fair Value Hedging | Cross currency interest rate swaps | Sales to customers
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0	0
Unrealized gain (loss) arising during period	0	0	0	0
Fair Value Hedging | Cross currency interest rate swaps | Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0	0
Unrealized gain (loss) arising during period	0	0	0	0
Fair Value Hedging | Cross currency interest rate swaps | Research and Development Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0	0
Unrealized gain (loss) arising during period	0	0	0	0
Fair Value Hedging | Cross currency interest rate swaps | Other (income) expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0	0
Unrealized gain (loss) arising during period	0	0	0	0
Fair Value Hedging | Cross currency interest rate swaps | Interest (income)/Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	25	0	27	0
Unrealized gain (loss) arising during period	25	0	27	0
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Sales to customers
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Research and Development Expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Investment Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments				6
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Other (income) expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	0	0	0
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Interest (income)/Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	7	4	(3)
Cash Flow Hedging | Foreign exchange contracts | Sales to customers
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	15	18	(3)	40
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	4	5	50	(34)
Cash Flow Hedging | Foreign exchange contracts | Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	192	(16)	138	105
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	97	(63)	175	(162)
Cash Flow Hedging | Foreign exchange contracts | Research and Development Expense
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	(4)	(39)	(220)	(167)
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	10	(30)	(242)	(131)
Cash Flow Hedging | Foreign exchange contracts | Other (income) expense
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	(1)	(15)	(16)	(59)
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	(3)	(49)	(24)	(86)
Cash Flow Hedging | Foreign exchange contracts | Interest (income)/Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	0	0	0	0
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	0	0	0	0
Cash Flow Hedging | Cross currency interest rate swaps | Sales to customers
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	0	0	0	0
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	0	0	0	0
Cash Flow Hedging | Cross currency interest rate swaps | Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	0	0	0	0
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	0		0	0
Cash Flow Hedging | Cross currency interest rate swaps | Research and Development Expense
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	0	0	0	0
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	0	0	0	0
Cash Flow Hedging | Cross currency interest rate swaps | Other (income) expense
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	0	0	0	0
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	0	0	0	0
Cash Flow Hedging | Cross currency interest rate swaps | Interest (income)/Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) arising during period	35	114	111	73
Summary of designated derivatives
Gain/ (Loss) reclassified from Accumulated OCI into income	$ 34	$ 106	$ 106	$ 63