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Employee Benefits - Components of Plan Benefit Expense Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 28, 2019 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain |  | $ 11 | $ 30 | $ 11 | $ 30
Recognized net (gain) loss |  | 23 | (36) | 34 | (47)
Other Nonpension Postretirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain |  | 6 | 0 | 6 | 0
Recognized net (gain) loss |  | (55) | 0 | (55) | 0
UNITED STATES | Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain | $ 11 |  |  |  |
Recognized net (gain) loss | 8 | $ 15 | (3) | $ 26 | $ (14)
UNITED STATES | Other Nonpension Postretirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain | 6 |  |  |  |
Recognized net (gain) loss | $ (55) |  |  |  |
Project K [Member] | Europe | Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain |  |  | 30 |  |
Recognized net (gain) loss |  |  | $ (33) |  |
Maximum [Member] | UNITED STATES | Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected return on plan assets | 7.50% |  |  |  |
Maximum [Member] | UNITED STATES | Other Nonpension Postretirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected return on plan assets | 7.50% |  |  |  |
Minimum [Member] | UNITED STATES | Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected return on plan assets | 7.00% |  |  |  |
Minimum [Member] | Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses | UNITED STATES | Other Nonpension Postretirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected return on plan assets | 7.00% |  |  |  |

X
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