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Financial Instruments (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 28, 2019
Dec. 30, 2017
Dec. 29, 2018
Derivatives, Fair Value [Line Items]      
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge $ 49,000,000    
Senior Notes 2,200,000,000   $ 7,700,000,000
Derivative, Net Liability Position, Aggregate Fair Value 415,000,000    
Collateral Already Posted, Aggregate Fair Value 0    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale 0    
Gain (Loss) on Sale of Equity Investments   $ 95,000,000  
Gain (Loss) on Sale of Equity Investments, after tax   $ 85,000,000  
Gain (Loss) on Sale of Equity Investments, net of tax, per share amount   $ 0.06  
Debt instrument, fair value 34,000,000,000   $ 32,000,000,000
Expected reclassification of net gain/(losses) related to hedge from accumulated OCI into net income within the next 12 months $ 47,000,000    
Interest Rate Contracts      
Derivatives, Fair Value [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 9.00%   29.00%
Commodity Contracts      
Derivatives, Fair Value [Line Items]      
Derivative, Higher Remaining Maturity Date 3 years    
Derivative, Notional Amount $ 1,100,000,000   $ 1,100,000,000
Foreign Exchange Contract      
Derivatives, Fair Value [Line Items]      
Derivative, Higher Remaining Maturity Date 2 years    
Derivative, Notional Amount $ 1,900,000,000   2,000,000,000.0
Net Investment Hedging [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 2,500,000,000   900,000,000
Interest Rate Contracts      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 5,000,000,000.0   $ 10,500,000,000
Cross Currency Interest Rate Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Higher Remaining Maturity Date 12 years