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Pension, Retiree Medical and Savings Plans (Categorized Plan Assets Measured at Fair Value) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
US Plan Assets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | $ 12,543 |  | $ 12,903 |
Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 3,090 |  | 3,460 | $ 2,894
Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 12,258 |  | 12,582 | 11,458
Postretirement Health Coverage [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 285 |  | 321 | $ 320
U.S. Equity securities, including preferred stock | Level 1 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1],[2] | 5,595 |  |  |
U.S. Equity securities, including preferred stock | Level 2 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1],[2] | 10 |  |  |
Fixed Income Commingled funds [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 356 |  | 383 |
Fixed Income Commingled funds [Member] | Level 1 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 356 |  |  |
Fixed Income Commingled funds [Member] | Level 2 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 0 |  |  |
Fixed Income Commingled funds [Member] | Level 3 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 0 |  |  |
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 212 |  | 217 |
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Level 1 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Level 2 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 212 |  |  |
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Level 3 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
US Government Agencies Debt Securities [Member] | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 1,674 |  | 1,365 |
US Government Agencies Debt Securities [Member] | Level 1 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
US Government Agencies Debt Securities [Member] | Level 2 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 1,674 |  |  |
US Government Agencies Debt Securities [Member] | Level 3 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
Corporate Bonds [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 478 |  | 493 |
Corporate Bonds [Member] | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 4,145 |  | 3,429 |
Corporate Bonds [Member] | Level 1 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
Corporate Bonds [Member] | Level 1 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
Corporate Bonds [Member] | Level 2 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 478 |  |  |
Corporate Bonds [Member] | Level 2 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 4,145 |  |  |
Corporate Bonds [Member] | Level 3 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
Corporate Bonds [Member] | Level 3 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 |  |  |
Government Securities | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3],[4] | 433 |  | $ 492 |
Government Securities | Level 1 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3],[4] | 0 |  |  |
Government Securities | Level 2 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3],[4] | 433 |  |  |
Government Securities | Level 3 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3],[4] | $ 0 |  |  |
Corporate Bonds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Representation of one fund in total U.S. plan assets |  | 28.00% |  | 23.00% |
Contracts With Insurance Companies | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | $ 36 |  | $ 36 |
Contracts With Insurance Companies | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1],[5] | 9 |  | 8 |
Contracts With Insurance Companies | Level 1 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 |  |  |
Contracts With Insurance Companies | Level 1 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1],[5] | 0 |  |  |
Contracts With Insurance Companies | Level 2 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 |  |  |
Contracts With Insurance Companies | Level 2 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1],[5] | 0 |  |  |
Contracts With Insurance Companies | Level 3 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 36 |  |  |
Contracts With Insurance Companies | Level 3 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1],[5] | 9 |  |  |
Cash And Cash Equivalents | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 27 |  | 19 |
Cash And Cash Equivalents | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 215 |  | 236 |
Cash And Cash Equivalents | Level 1 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 27 |  |  |
Cash And Cash Equivalents | Level 1 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 215 |  |  |
Cash And Cash Equivalents | Level 2 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  |  |
Cash And Cash Equivalents | Level 2 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 |  |  |
Cash And Cash Equivalents | Level 3 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  |  |
Cash And Cash Equivalents | Level 3 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 |  |  |
Sub-Total U.S. Plan Assets | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 11,860 |  | 12,159 |
Sub-Total U.S. Plan Assets | Level 1 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 5,810 |  |  |
Sub-Total U.S. Plan Assets | Level 2 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 6,041 |  |  |
Sub-Total U.S. Plan Assets | Level 3 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 9 |  |  |
Real Estate Funds [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [6] | 102 |  | 102 |
Real Estate Funds [Member] | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [6] | 618 | [1] | 675 |
Sub-Total International Plan Assets | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 2,981 |  | 3,351 |
Sub-Total International Plan Assets | Level 1 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 2,004 |  |  |
Sub-Total International Plan Assets | Level 2 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 941 |  |  |
Sub-Total International Plan Assets | Level 3 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 36 |  |  |
Dividends And Interest Receivable | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 7 |  | 7 |
Dividends And Interest Receivable | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 65 |  | 69 |
Equity Securities [Member] | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1,651 | [2] | 1,928 |
Equity Securities [Member] | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 5,605 | [2] | $ 6,904 |
Equity Securities [Member] | Level 1 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 1,621 |  |  |
Equity Securities [Member] | Level 2 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 30 |  |  |
Equity Securities [Member] | Level 3 | Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 |  |  |
Equity Securities [Member] | Level 3 | Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 0 |  |  |
Large-Cap Fund(s) In U.S. Commingled Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Representation of one fund in total U.S. plan assets |  | 15.00% |  | 19.00% |
Real Estate [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Redemption period - Min |  | 45 |  |  |
Redemption period |  | 90 |  |  |
[1] | 2018 and 2017 amounts include $285 million and $321 million, respectively, of retiree medical plan assets that are restricted for purposes of providing health benefits for U.S. retirees and their beneficiaries.
[2] | The equity securities portfolio was invested in U.S. and international common stock and commingled funds, and the preferred stock portfolio in the U.S. was invested in domestic and international corporate preferred stock investments. The common stock is based on quoted prices in active markets. The U.S. commingled funds are based on fair values of the investments owned by these funds that are benchmarked against various U.S. large, mid-cap and small company indices, and includes one large-cap fund that represents 15% and 19% of total U.S. plan assets for 2018 and 2017, respectively. The international commingled funds are based on the fair values of the investments owned by these funds that track various non-U.S. equity indices. The preferred stock investments are based on quoted bid prices for comparable securities in the marketplace and broker/dealer quotes in active markets.
[3] | Based on the fair value of the investments owned by these funds that track various government and corporate bond indices.
[4] | These investments are based on quoted bid prices for comparable securities in the marketplace and broker/dealer quotes in active markets. Corporate bonds of U.S.-based companies represent 28% and 23% of total U.S. plan assets for 2018 and 2017, respectively.
[5] | Based on the fair value of the contracts as determined by the insurance companies using inputs that are not observable. The changes in Level 3 amounts were not significant in the years ended December 29, 2018 and December 30, 2017.
[6] | The real estate commingled funds include investments in limited partnerships. These funds are based on the net asset value of the appraised value of investments owned by these funds as determined by independent third parties using inputs that are not observable. The majority of the funds are redeemable quarterly subject to availability of cash and have notice periods ranging from 45 to 90 days.

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