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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
 12 Months Ended
Jan. 03, 2025
USD ($)
reporting_unit
Dec. 29, 2023
USD ($)
reporting_unit
Dec. 30, 2022
USD ($)
Significant Accounting Policies [Line Items]      
Decrease in income before income taxes from changes in contract estimates $ 153 $ 100 $ 113
Contract with customer, performance obligation satisfied in previous period 13 8 9
Internal research and development costs included in selling, general and administrative expenses 150 128 116
Accounts payable and accrued liabilities 2,225 2,277  
Less: restricted cash at end of year $ 141 $ 151 $ 167
Number of reporting units (in reporting units) | reporting_unit 8 7  
Cash and Cash Equivalents      
Significant Accounting Policies [Line Items]      
Accounts payable and accrued liabilities $ 94 $ 136  
UNITED KINGDOM      
Significant Accounting Policies [Line Items]      
Decrease in income before income taxes from changes in contract estimates $ 40