Business Acquisition and Equity Method Investment [Line Items]

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- Definition

Business Acquisition, Per Share Value, Percentage

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- Definition

Business Combination Dividend Distribution

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Business Combination Dividend Distribution, Change in Amount of Dividend Distribution

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Business combination, recognized liabilities, net debt

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- Definition

Other transaction details related to an equity method investment.

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- Definition

Exchange Ratio used in calculation of Acquisition

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The amount of financial or other support the reporting entity has provided (explicitly or implicitly) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted with obtaining another type of support.

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The period in which the reporting entity will provide financial or other support.

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Preferred Stock Return on NCI Accretion Percent

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- Definition

Threshold Percentage of Ownership by Third Party

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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- Definition

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 currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

Total costs of sales and operating expenses for the period.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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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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The loss recognized on termination of a contract.

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- Definition

Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Redemption value, as if currently redeemable, of redeemable noncontrolling interest classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Price of a single share of a number of saleable stocks of a company.

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Acquisitions - Additional Information (Details) € / shares in Units, $ / shares in Units, € in Millions, shares in Millions, $ in Millions						3 Months Ended		9 Months Ended
	Jul. 11, 2018 EUR (€) € / shares	Jun. 28, 2018 USD ($) $ / shares	Jun. 20, 2018 USD ($)	May 29, 2018 $ / shares shares	Dec. 14, 2017 € / shares	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Apr. 25, 2018 € / shares	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 25, 2017 USD ($)	Apr. 01, 2017
Business Acquisition And Equity Method Investments
Redeemable Noncontrolling Interest						$ 1,137		$ 1,137				$ 1,148
Goodwill						31,306		31,306				$ 31,426
Costs and Expenses						11,304	$ 10,450	33,373	$ 31,114
Comcast Sky offer
Business Acquisition And Equity Method Investments
Business Acquisition, Share Price \| € / shares	€ 14.75									€ 12.50
21CF \| Pending 21CF acquisition of Sky
Business Acquisition And Equity Method Investments
Business Acquisition, Share Price \| € / shares	€ 14.00				€ 10.75
Equity Method Investment, Other Transaction Details					39.00%
Financial or Other Support, Period	15 years
21CF \| Pending 21CF acquisition of Sky \| Minimum
Business Acquisition And Equity Method Investments
Financial or Other Support \| €	€ 100
21CF \| Pending 21CF acquisition of Sky \| Scenario, 21CF Acquisition of Sky not completed
Business Acquisition And Equity Method Investments
Business Acquisition, Share Price \| € / shares	€ 14.00
21CF \| Pending 21CF acquisition of Sky \| Scenario, 21CF Acquisition of Sky not completed \| Minimum
Business Acquisition And Equity Method Investments
Business Acquisition, Share Price \| € / shares	€ 13.00
21CF \| Scenario, 21CF Acquisition of Sky not completed \| Maximum
Business Acquisition And Equity Method Investments
Threshold Percentage of Ownership by Third Party	50.00%
New Disney \| Pending 21CF acquisition of Sky
Business Acquisition And Equity Method Investments
Financial or Other Support, Period	15 years
21CF \| Pending Approval
Business Acquisition And Equity Method Investments
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net											$ (17,100)
Business Acquisition, Per Share Value, Percentage		50.00%
Business Acquisition, Share Price \| $ / shares				$ 103.926
Business Combination Dividend Distribution, Change in Amount of Dividend Distribution			$ 2,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares \| shares				343
Business combination, recognized liabilities, net debt											13,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities											23,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents											6,800
Loss on Contract Termination			2,500
Gain (Loss) on Contract Termination			1,500
21CF \| Pending Approval \| Minimum
Business Acquisition And Equity Method Investments
Business Combination Dividend Distribution			6,500
Business Acquisition, Share Price \| $ / shares		$ 38.00
21CF \| Pending Approval \| Maximum
Business Acquisition And Equity Method Investments
Business Combination Dividend Distribution			$ 8,500
Business Combination, Consideration Transferred		$ 35,700
21CF \| Pending Approval \| Scenario, Stock Price Greater than $114.32
Business Acquisition And Equity Method Investments
Share Price \| $ / shares		$ 114.32
Exchange Ratio used in calculation of Acquisition \| $ / shares		0.3324
21CF \| Pending Approval \| Scenario, Stock Price Less than $93.53
Business Acquisition And Equity Method Investments
Share Price \| $ / shares		93.53
Exchange Ratio used in calculation of Acquisition \| $ / shares		0.4063
21CF \| Pending Approval \| Scenario, Stock Price Greater than or equal to $93.53 and Less than or equal to $114.32 \| Minimum
Business Acquisition And Equity Method Investments
Business Acquisition, Share Price \| $ / shares		38.00
Share Price \| $ / shares		93.53
21CF \| Pending Approval \| Scenario, Stock Price Greater than or equal to $93.53 and Less than or equal to $114.32 \| Maximum
Business Acquisition And Equity Method Investments
Share Price \| $ / shares		$ 114.32
21CF \| Pending 21CF acquisition of Sky
Business Acquisition And Equity Method Investments
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net											(49,300)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities											51,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents											$ 1,800
BAMTech, LLC
Business Acquisition And Equity Method Investments
Equity Method Investment, Ownership Percentage												75.00%	42.00%	33.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net													$ 3,900
Redeemable Noncontrolling Interest													1,100
Goodwill													3,500
Revenue								300
Costs and Expenses								500
BAMTech, LLC \| NHL
Business Acquisition And Equity Method Investments
Redeemable Noncontrolling Interest, Equity, Redemption Value													$ 500
BAMTech, LLC \| MLB
Business Acquisition And Equity Method Investments
Redeemable Noncontrolling Interest, Equity, Redemption Value						$ 597		$ 597
BAMTech, LLC \| MLB \| Minimum
Business Acquisition And Equity Method Investments
Preferred Stock on NCI Accretion Percentage													8.00%
Redeemable Noncontrolling Interest, Equity, Redemption Value													$ 563
BAMTech, LLC \| Hearst Corporation
Business Acquisition And Equity Method Investments
Equity Method Investment, Ownership Percentage						20.00%		20.00%
BAMTech, LLC \| BAMTech Notes Payable
Business Acquisition And Equity Method Investments
Notes Payable, Current													1,600
NHL \| BAMTech, LLC \| Minimum
Business Acquisition And Equity Method Investments
Redeemable Noncontrolling Interest, Equity, Redemption Value													300
NHL \| BAMTech, LLC \| Maximum
Business Acquisition And Equity Method Investments
Redeemable Noncontrolling Interest, Equity, Redemption Value													$ 350