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Nature of Operations and Significant Accounting Policies - Schedule of Retrospective Impact of Adoption (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Labor and Fringe | $ 695 | $ 725 | $ 2,060 | $ 2,271
Restructuring Charge | 0 | 1 | 0 | 226
Restructuring Charge - Non-Operating | 0 | 0 | 0 | (70)
Other Income - Net | $ 19 | 14 | $ 54 | 41
As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Labor and Fringe |  | 717 |  | 2,249
Restructuring Charge |  | 1 |  | 296
Restructuring Charge - Non-Operating |  | 0 |  | 0
Other Income - Net |  | 6 |  | 19
Reclass |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Labor and Fringe |  | 8 |  | 22
Restructuring Charge |  | 0 |  | (70)
Restructuring Charge - Non-Operating |  | 0 |  | (70)
Other Income - Net |  | $ 8 |  | $ 22

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