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Debt Long-term Debt Footnote K (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | May 31, 2012 | Sep. 28, 2019 | Jan. 02, 2021 | Dec. 28, 2019 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense | $ 20 |  | $ 16 | $ 281 | $ 284 |
Debt repurchase amount |  |  | $ 1,000 |  |  |
Notional amounts of interest rate swaps |  |  |  | 7,213 | $ 6,563 |
3.125% U.S. Dollar Debentures Due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense |  |  |  | 17 |  |
Debt Instrument, Face Amount |  | $ 700 |  |  |  |
Debt repurchase amount | $ 358 |  |  | $ 358 |  | $ 342
Debt Instrument, Term |  | 10 years |  |  |  |
Debt instrument, stated interest rate | 3.125% | 3.125% |  |  |  |

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