Financial Instruments Additional Information (Details) $ in Millions, € in Billions, £ in Billions	3 Months Ended			9 Months Ended
	Sep. 27, 2015 USD ($)	Jun. 28, 2015 USD ($)	Sep. 28, 2014 USD ($)	Sep. 27, 2015 USD ($)	Sep. 28, 2014 USD ($)	Sep. 27, 2015 GBP (£)	Sep. 27, 2015 EUR (€)	Dec. 28, 2014 USD ($)
Derivative [Line Items]
Derivative, collateral, obligation to return cash	$ 40			$ 40				$ 141
Derivative, collateral, right to reclaim cash	40			40				$ 141
Loss on discontinuation of interest rate cash flow hedge		$ 227		$ 227	$ 0
Maximum length of time hedged in foreign currency cash flow hedge				2 years
Maximum length of time hedged in cross-currency net investment hedges				4 years
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	3			$ 3
Net deferred gains on net investment hedges	195		$ 269	421	$ 109
Foreign exchange contracts
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within 12 months				$ 45
Foreign exchange contracts | Not designated as hedging instrument
Derivative [Line Items]
Derivative, term				4 years
Cross-currency contracts | Euro Member Countries, Euro
Derivative [Line Items]
Derivative asset, notional amount	1,100			$ 1,100
Derivative asset, notional amount unwound during the period				1,900
Cross-currency contracts | United Kingdom, Pounds
Derivative [Line Items]
Derivative asset, notional amount	1,400			1,400
Derivative asset, notional amount unwound during the period				3,200
Cross-currency contracts | Australia, Dollars
Derivative [Line Items]
Derivative asset, notional amount unwound during the period				750
Cross-currency contracts | Japan, Yen
Derivative [Line Items]
Derivative asset, notional amount unwound during the period				50
Interest rate contracts | Not designated as hedging instrument
Derivative [Line Items]
Derivative asset, notional amount unwound during the period				$ 6,400
Net Investment Hedging | Designated as hedging instrument
Derivative [Line Items]
Net deferred gains on net investment hedges	$ 22
Net Investment Hedging | Debt | Designated as hedging instrument | Euro Member Countries, Euro
Derivative [Line Items]
Derivative, amount of hedged item | €							€ 0.8
Net Investment Hedging | Debt | Designated as hedging instrument | United Kingdom, Pounds
Derivative [Line Items]
Derivative, amount of hedged item | £						£ 0.4