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Financial Instruments - Long-Term Debt (Details) - USD ($)
$ in Millions
Apr. 04, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Net fair value adjustments related to hedging and purchase accounting $ 0 $ 0
Net unamortized discounts, premiums and debt issuance costs (3) (2)
Total long-term debt, carried at historical proceeds, as adjusted 35,347 37,133
Current portion of long-term debt, carried at historical proceeds, as adjusted (not included above) 3,676 2,002
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Total long-term debt, principal amount 34,032 35,774
Net fair value adjustments related to hedging and purchase accounting 1,512 1,562
Net unamortized discounts, premiums and debt issuance costs (200) (207)
Other long-term debt 4 4
Total long-term debt, carried at historical proceeds, as adjusted 35,347 37,133
Current portion of long-term debt, carried at historical proceeds, as adjusted (not included above) $ 3,676 $ 2,002