Amount of other net assets (liabilities) acquired (assumed) at the acquisition date.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Feb. 14, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 2,566	$ 2,344	$ 2,405
Alpha Holding Company, LLC
Business Acquisition [Line Items]
Property and equipment	$ 299
Intangible assets	646
Goodwill	269
Other assets and liabilities, net (including $4 million of cash acquired)	1
Identifiable assets acquired and liabilities assumed	$ 1,215
Weighted-average useful life	20 years
Cash acquired	$ 4
Minimum \| Alpha Holding Company, LLC
Business Acquisition [Line Items]
Estimated useful lives	3 years
Maximum \| Alpha Holding Company, LLC
Business Acquisition [Line Items]
Estimated useful lives	70 years