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Preparation Of Interim Financial Statements (Consolidated Statements of Cash Flows) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Changes in other current assets $ (2,729) $ (106)
Equipment installment receivables and related sales 220 451
Other - net 1,283 (1,556)
Net Cash Provided by (Used in) Operating Activities 31,522 28,473
(Purchases) sales of securities, net (234) 235
Cash collections of deferred purchase price 500 665
Cash (Used in) Provided by Investing Activities (59,987) (14,364)
Change in cash and cash equivalents and restricted cash (42,144) 42,811
Historical Accounting Method [Member] | Adjustments for New Accounting Pronouncement [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Changes in other current assets (2,731) (106)
Equipment installment receivables and related sales 720 1,116
Other - net 1,399 (1,420)
Net Cash Provided by (Used in) Operating Activities 32,136 29,274
(Purchases) sales of securities, net 7 (2)
Cash collections of deferred purchase price 0 0
Cash (Used in) Provided by Investing Activities (60,246) (15,266)
Change in cash and cash equivalents and restricted cash (41,789) 42,711
Effect of Adoption | ASU 2016-15 [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Changes in other current assets 0 0
Equipment installment receivables and related sales (500) (665)
Other - net 0 0
Net Cash Provided by (Used in) Operating Activities (500) (665)
(Purchases) sales of securities, net 0 0
Cash collections of deferred purchase price 500 665
Cash (Used in) Provided by Investing Activities 500 665
Change in cash and cash equivalents and restricted cash 0 0
Effect of Adoption | ASU 2016-18 [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Changes in other current assets 2 0
Equipment installment receivables and related sales 0 0
Other - net (116) (136)
Net Cash Provided by (Used in) Operating Activities (114) (136)
(Purchases) sales of securities, net (241) 237
Cash collections of deferred purchase price 0 0
Cash (Used in) Provided by Investing Activities (241) 237
Change in cash and cash equivalents and restricted cash $ (355) $ 100