Number of Pharmacies Acquired

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions - Wellpartner Acquisition (Details) $ in Millions	Nov. 30, 2017 USD ($) pharmacy	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Assets Acquired:
Goodwill		$ 38,451	$ 38,249	$ 38,106
Wellpartner Acquisition
Business Acquisition
Consideration transferred	$ 380
Number of pharmacies acquired \| pharmacy	2
Assets Acquired:
Assets	$ 532
Intangible assets	233
Goodwill	182
Liabilities	$ 152
Oregon \| Wellpartner Acquisition
Business Acquisition
Number of pharmacies acquired \| pharmacy	1