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Fair Value Measurements - Summary of Hierarchy for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 30, 2018
Assets:    
Available-for-sale securities $ 1,304 $ 2,329
Marketable equity security 41 39
Debt securities in government sponsored entities    
Assets:    
Available-for-sale securities 21 21
Corporate debt securities    
Assets:    
Available-for-sale securities 717 1,058
U.S. Treasury securities    
Assets:    
Available-for-sale securities 566 1,250
Fair Value, Measurements, Recurring    
Assets:    
Marketable equity security 41 39
Deferred compensation plan assets 43 34
Total assets measured at fair value 3,193 3,234
Liabilities:    
Deferred compensation plan liability 41 33
Fair Value, Measurements, Recurring | Debt securities in government sponsored entities    
Assets:    
Available-for-sale securities 21 21
Fair Value, Measurements, Recurring | Corporate debt securities    
Assets:    
Available-for-sale securities 717 1,058
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Assets:    
Available-for-sale securities 566 1,250
Fair Value, Measurements, Recurring | Money market funds (cash equivalents)    
Assets:    
Money market funds (cash equivalents) 1,805 832
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Marketable equity security 41 39
Total assets measured at fair value 2,412 2,121
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities    
Assets:    
Available-for-sale securities 566 1,250
Fair Value, Measurements, Recurring | Level 1 | Money market funds (cash equivalents)    
Assets:    
Money market funds (cash equivalents) 1,805 832
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Deferred compensation plan assets 43 34
Total assets measured at fair value 781 1,113
Liabilities:    
Deferred compensation plan liability 41 33
Fair Value, Measurements, Recurring | Level 2 | Debt securities in government sponsored entities    
Assets:    
Available-for-sale securities 21 21
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities    
Assets:    
Available-for-sale securities $ 717 $ 1,058