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Segment Information Segment Information - Reconciliation from Operating Income to Adjusted Operating Income (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) store	Mar. 31, 2018 USD ($)
Operating income	$ 2,690	$ 1,996
Amortization of intangible assets	622	210
Acquisition-related transaction and integration costs	148	43
Store Rationalization Charges	135	0
Loss on divestiture of subsidiary	0	86
Interest income on financing for the Aetna Acquisition	0	(42)
Adjusted Operating Income (Loss)	$ 3,595	2,293
Retail Long-Term Care Segment [Member]
Number of Under Performing Stores | store	46
Loss on divestiture of subsidiary		$ 725

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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