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Nature of Operations and Significant Accounting Policies - Schedule of Retrospective Impact of Adoption (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Labor and Fringe | $ 696 | $ 795
Restructuring Charge | 0 | 110
Restructuring Charge - Non-Operating | 0 | (63)
Other Income - Net | $ 17 | 13
As Previously Reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Labor and Fringe |  | 789
Restructuring Charge |  | 173
Restructuring Charge - Non-Operating |  | 0
Other Income - Net |  | 7
Reclassification |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Labor and Fringe |  | 6
Restructuring Charge |  | (63)
Restructuring Charge - Non-Operating |  | (63)
Other Income - Net |  | $ 6

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