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Preparation Of Interim Financial Statements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Jan. 01, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00% 35.00%  
Cumulative effect of accounting changes $ (658)   $ (658)    
Net Income [Member]          
Change in Accounting Estimate [Line Items]          
Change in Accounting Estimate Financial Effect (in millions) $ 107        
Change in Accounting Estimate, Description Decreased other cost of revenues and impacted net income $107, or $0.02 per diluted share.        
Earnings Per Share, Diluted [Member]          
Change in Accounting Estimate [Line Items]          
Change In Accounting Estimate Financial Effect (per share) $ 0.02        
Customer Fulfillment Costs [Member]          
Change in Accounting Estimate [Line Items]          
Estimated economic useful life   4 years 10 months      
Change in Accounting Estimate, Description   To better reflect the estimated economic life of entertainment group customers, we extended the period to 58 months.      
Customer Fulfillment Costs [Member] | Net Income [Member]          
Change in Accounting Estimate [Line Items]          
Change in Accounting Estimate Financial Effect (in millions)     $ 233    
Change in Accounting Estimate, Description     Decreased other cost of services and impacted net income $233, or $0.04 per diluted share.    
Customer Fulfillment Costs [Member] | Earnings Per Share, Diluted [Member]          
Change in Accounting Estimate [Line Items]          
Change In Accounting Estimate Financial Effect (per share)     $ 0.04    
ASC 606 [Member] | Retained Earnings [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         $ 2,342
ASC 606 [Member] | Contract Asset [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         1,737
ASC 606 [Member] | Deferred Customer Contract Acquisition Costs [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         1,454
ASC 606 [Member] | Other Assets [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         (239)
ASC 606 [Member] | Noncontrolling Interest [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         35
ASC 606 [Member] | Other Liabilities [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         (212)
ASC 606 [Member] | Deferred Income Tax Liability [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         787
ASU 2016-01 [Member] | Retained Earnings [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         658
ASU 2016-01 [Member] | Accumulated Other Comprehensive Income [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative effect of accounting changes         $ (658)