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Nature of Operations and Significant Accounting Policies - Schedule of Retrospective Impact of Adoption (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Labor and Fringe | $ 669 | $ 751 | $ 1,365 | $ 1,546
Restructuring Charge | 0 | 115 | 0 | 225
Restructuring Charge - Non-Operating | 0 | (7) | 0 | (70)
Other Income - Net | $ 18 | 14 | $ 35 | 27
As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Labor and Fringe |  | 743 |  | 1,532
Restructuring Charge |  | 122 |  | 295
Restructuring Charge - Non-Operating |  | 0 |  | 0
Other Income - Net |  | 6 |  | 13
Reclass |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Labor and Fringe |  | 8 |  | 14
Restructuring Charge |  | (7) |  | (70)
Restructuring Charge - Non-Operating |  | (7) |  | (70)
Other Income - Net |  | $ 8 |  | $ 14

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