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Segment Reporting - Schedule of Equity Income from Affiliates and Depreciation and Amortization Included in Segment Profits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Equity income from affiliates | $ 42 | $ 86 | $ 205
Depreciation and amortization | (4,637) | (5,441) | (6,375)
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity income from affiliates | (7) | 105 | 70
Depreciation and amortization | (212) | (183) | (100)
Operating Segments | Pharmaceutical |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity income from affiliates | (7) | 105 | 70
Depreciation and amortization | (125) | (160) | (82)
Operating Segments | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity income from affiliates | 0 | 0 | 0
Depreciation and amortization | $ (87) | $ (23) | $ (18)

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