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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flows from Operating Activities      
Net Income $ 23,547 $ 10,557 $ 10,198
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 16,606 16,460 16,496
Employee retirement benefits (5,052) 8,198 7,426
Deferred income taxes 5,785 (952) (223)
Provision for uncollectible accounts 993 972 1,026
Equity in earnings of unconsolidated businesses, net of dividends received (102) 77 36
Changes in current assets and liabilities, net of effects from acquisition/disposition of businesses      
Accounts receivable (843) (1,717) (966)
Inventories 56 (136) 208
Other assets (143) 306 86
Accounts payable and accrued liabilities 925 1,144 (1,607)
Other, net (2,954) (3,423) (2,900)
Net cash provided by operating activities 38,818 31,486 29,780
Cash Flows from Investing Activities      
Capital expenditures (including capitalized software) (16,604) (16,175) (16,244)
Acquisitions of investments and businesses, net of cash acquired (494) (913) (1,797)
Acquisitions of wireless licenses (580) (4,298) (221)
Proceeds from dispositions of wireless licenses 2,111 363  
Net change in short-term investments 63 27 35
Other, net 671 494 977
Net cash used in investing activities (14,833) (20,502) (17,250)
Cash Flows from Financing Activities      
Proceeds from long-term borrowings 49,166 4,489 11,060
Repayments of long-term borrowings and capital lease obligations (8,163) (6,403) (11,805)
Decrease in short-term obligations, excluding current maturities (142) (1,437) 1,928
Dividends paid (5,936) (5,230) (5,555)
Proceeds from sale of common stock 85 315 241
Purchase of common stock for treasury (153)    
Special distribution to noncontrolling interest (3,150) (8,325)  
Other, net (5,257) (4,662) (1,705)
Net cash provided by (used in) financing activities 26,450 (21,253) (5,836)
Increase (decrease) in cash and cash equivalents 50,435 (10,269) 6,694
Cash and cash equivalents, beginning of period 3,093 13,362 6,668
Cash and cash equivalents, end of period $ 53,528 $ 3,093 $ 13,362