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Condensed Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash Flows from Operating Activities    
Net income $ 10,310 $ 10,053
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 8,298 8,269
Employee retirement benefits 562 354
Deferred income taxes 253 1,812
Provision for uncollectible accounts 473 507
Equity in earnings of unconsolidated businesses, net of dividends received (1,841) (95)
Changes in current assets and liabilities, net of effects from acquisition/disposition of businesses (847) (1,660)
Other, net (2,404) (2,092)
Net cash provided by operating activities 14,804 17,148
Cash Flows from Investing Activities    
Capital expenditures (including capitalized software) (8,494) (7,616)
Acquisitions of investments and businesses, net of cash acquired (179) (76)
Acquisitions of wireless licenses (271) (264)
Proceeds from dispositions of wireless licenses 2,367  
Other, net 231 121
Net cash used in investing activities (6,346) (7,835)
Cash Flows from Financing Activities    
Proceeds from long-term borrowings 20,245 499
Repayments of long-term borrowings and capital lease obligations (11,317) (2,330)
Increase (decrease) in short-term obligations, excluding current maturities 279 (432)
Dividends paid (3,583) (2,946)
Proceeds from sale of common stock 34 74
Purchase of common stock for treasury   (153)
Special distribution to noncontrolling interest   (3,150)
Acquisition of noncontrolling interest (58,886)  
Other, net (2,982) (2,180)
Net cash used in financing activities (56,210) (10,618)
Decrease in cash and cash equivalents (47,752) (1,305)
Cash and cash equivalents, beginning of period 53,528 3,093
Cash and cash equivalents, end of period $ 5,776 $ 1,788