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Financing (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Oct. 01, 2021
Apr. 02, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Debt discounts, premiums and debt issuance costs $ 121   $ 132
Common stock, par value $ 0.01   $ 0.01
U.S. dollar and euro-denominated commercial paper | Commercial paper      
Debt Instrument [Line Items]      
Weighted average interest rate of long-term debt, interest rate (0.01%)    
Weighted average maturity of long-term debt, at point in time 22 days    
Zero-coupon LYONs due 2021 | Convertible debt      
Debt Instrument [Line Items]      
Shares issued under debt conversion, shares   912  
Debt conversion, converted instrument, deferred tax liability   $ 10  
Long-term debt | Revolving credit facility | Five-Year Facility      
Debt Instrument [Line Items]      
Line of credit $ 5,000