Acquisitions, Dispositions And Other Adjustments (Fair Value of Assets Acquired and Liabilities Assumed) (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets acquired
Noncurrent Inventories and Theatrical Film and Television Production Costs	$ 12,014	$ 7,713
Goodwill	146,106	146,370
Liabilities assumed
Debt maturing within one year	11,608	$ 10,255
Time Warner Inc. [Member]
Assets acquired
Cash	1,889
Accounts Receivable	9,020
All other current assets	2,913
Noncurrent Inventories and Theatrical Film and Television Production Costs	5,591
Property, plant and equipment	4,693
Investments and other assets	9,438
Goodwill	38,801
Total assets acquired	129,572
Liabilities assumed
Current liabilities, excluding current portion of long-term debt	8,294
Debt maturing within one year	4,471
Long-term debt	18,394
Other noncurrent liabilities	19,054
Total liabilities assumed	50,213
Net assets acquired	79,359
Noncontrolling interest	(1)
Aggregate value of consideration paid	79,358
Time Warner Inc. [Member] | Distribution Networks [Member]
Assets acquired
Intangible assets subject to amortization	18,040
Time Warner Inc. [Member] | Released television and film content [Member]
Assets acquired
Intangible assets subject to amortization	10,806
Time Warner Inc. [Member] | Trademarks/trade names [Member]
Assets acquired
Intangible assets subject to amortization	18,081
Time Warner Inc. [Member] | Other [Member]
Assets acquired
Intangible assets subject to amortization	$ 10,300