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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
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 4,519	$ 4,676	$ 5,471
Operating Segments
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	4	7	(105)
Depreciation and amortization	335	212	183
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	4	7	(105)
Depreciation and amortization	243	125	160
Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	0	0	0
Depreciation and amortization	82	75	10
Operating Segments | All Other
Segment Reporting Information [Line Items]
Equity (income) loss from affiliates	0	0	0
Depreciation and amortization	$ 10	$ 12	$ 13

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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-Section 50
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- Definition

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+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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