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Nature of Operations and Significant Accounting Policies - Retrospective Impact of Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
Operating Expense: |  |  |
Labor and Fringe | $ 2,738 | $ 2,946 | $ 3,135
Operating Restructuring Charge | 0 | 240 | 0
Non-Operating Income (Expense): |  |  |
Restructuring Charge - Non-Operating | 0 | (85) | 0
Other Income - Net | $ 74 | 53 | 22
As Previously Reported |  |  |
Operating Expense: |  |  |
Labor and Fringe |  | 2,914 | 3,159
Operating Restructuring Charge |  | 325 | 0
Non-Operating Income (Expense): |  |  |
Restructuring Charge - Non-Operating |  | 0 | 0
Other Income - Net |  | 21 | 46
Reclass | Accounting Standards Update 2017-07 |  |  |
Operating Expense: |  |  |
Labor and Fringe |  | 32 | (24)
Operating Restructuring Charge |  | (85) | 0
Non-Operating Income (Expense): |  |  |
Restructuring Charge - Non-Operating |  | (85) | 0
Other Income - Net |  | $ 32 | $ (24)

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