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Financial Instruments (Tables)
 6 Months Ended
Jun. 29, 2018
Investments, All Other Investments [Abstract]  
Carrying Amounts and Estimated Fair Values of Company's Long-Term Debt and Foreign Currency Forward Contracts
The carrying amounts and estimated fair values of the Company’s other financial instruments are presented in the table below.
 
June 29, 2018
 
December 31, 2017
 
Carrying
 Amount
 
Estimated
 Fair Value
 
Carrying
 Amount
 
Estimated
 Fair Value
 
(in millions)
Senior notes (1)
$
3,900

 
$
3,944

 
$
3,330

 
$
3,502

Foreign currency forward contracts (2)
$
(5
)
 
$
(5
)
 
$
10

 
$
10

__________________
(1) 
The Company measures the fair value of its senior notes using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market.
(2) 
The Company measures the fair values of foreign currency forward contracts based on forward exchange rates. See Note 18 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.