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Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2007
Dec. 31, 2011
8.125% New Cingular Wireless Services Inc Notes due May 2012 [Member]
Dec. 31, 2011
5.875% Global Notes due February 1 2012 [Member]
Feb. 29, 2012
Callable long-term debt due February 15 2056 [Member]
Dec. 31, 2011
Callable long-term debt due February 15 2056 [Member]
Dec. 31, 2011
Other Long-Term Debt [Member]
Dec. 31, 2011
The Four-Year Agreement [Member]
Dec. 31, 2011
The Four-Year Agreement [Member]
S&P A+/Fitch A+/Moody's A1 credit rating or better
Dec. 31, 2011
The Four-Year Agreement [Member]
S&P A/Fitch A/Moody's A2 credit rating
Dec. 31, 2011
The Four-Year Agreement [Member]
S&P A-/Fitch A-/Moody's A3 credit rating or below
Dec. 31, 2011
The Four-Year Agreement [Member]
In the event of default on unsecured debt
Jan. 31, 2012
364 - Day Agreement [Member]
Dec. 31, 2011
364 - Day Agreement [Member]
Dec. 31, 2011
364 - Day Agreement [Member]
S&P A+/Fitch A+/Moody's A1 credit rating or better
Dec. 31, 2011
364 - Day Agreement [Member]
S&P A/Fitch A/Moody's A2 credit rating
Dec. 31, 2011
364 - Day Agreement [Member]
S&P A-/Fitch A-/Moody's A3 credit rating or below
Dec. 31, 2011
364 - Day Agreement [Member]
In the event of default on unsecured debt
Dec. 31, 2011
2.95% Global Notes Due In May 2016 [Member]
Dec. 31, 2011
2.4% Global Notes Due In August 2016 [Member]
Dec. 31, 2011
4.45% Global Notes Due In May 2021 [Member]
Dec. 31, 2011
5.55% Global Notes Due In August 2041 [Member]
Dec. 31, 2011
3.875% Global Notes Due In August 2021 [Member]
Feb. 29, 2012
0.875% Global Notes due 2015 [Member]
Feb. 29, 2012
1.60% Global Notes due 2017 [Member]
Feb. 29, 2012
3.00% Global Notes due February 2022 [Member]
Dec. 31, 2011
Bridge Loan [Member]
Mar. 31, 2011
Bridge Loan [Member]
Annual put reset securities issued - principal amount $ 1,000                                                          
Annual put reset securities issued - maturity date April 2021                                                          
Zero-coupon note - principal amount       500                                                    
Zero-coupon note - redemption amount if held until maturity 1,030                                                          
Zero-coupon note - maturity date May 2022                                                          
Debt instrument - face amount                                         1,750 1,500 1,250 2,000 1,500 1,000 1,000 1,000   20,000
Debt instument - stated percentage rate         8.125% 5.875%                             2.95% 2.40% 4.45% 5.55% 3.875% 0.875% 1.60% 3.00%    
Debt instrument - issuance date                                                           March 31, 2011
Debt instruments - maturity date         May 01, 2012 Feb. 01, 2012 Feb. 15, 2012 Feb. 15, 2056                         May 01, 2016 Aug. 01, 2016 May 01, 2021 Aug. 01, 2041 Aug. 01, 2021 Feb. 01, 2015 Feb. 01, 2017 Feb. 01, 2022    
Commercial paper - repayments net of issuance 1,625                                                          
Repayment of long-term debt (7,574) (9,294) (8,652)   2,000 1,000     4,543                                          
Early redemption of long-term debt             1,200                                              
Weighted average interest rate of long-term debt repayments during the period (in hundredths) 6.58%                                                          
Repayments of capitalized leases during the period 31                                                          
Credit agreement - expiration date                   12/19/2015           12/17/2012                            
Credit agreement - potential additional extension of term (years)                   1                                        
Credit agreement - maximum potential extension of term (days)                               364                            
Credit agreement - minimum amount of other debt that would trigger cross-default provisions if not paid when due and accelerated                   400           400                            
Credit agreement - minimum amount of money judgment in favor of creditor that would trigger cross-default provisions                   400           400                            
Credit agreement - change in control (beneficial ownership percentage) (in hundredths)                   50.00%           50.00%                            
Credit agreement - minimum lender approval (percentage) for extension of term                   50.00%           50.00%                            
Credit agreement - interest rate spread above Fed funds rate (in hundredths)                   0.50%           0.50%                            
Credit agreement - base rate                   EITHER 1) one-month, three-month, or six-month London interbank offered rate (LIBOR) OR 2) highest of Citibank prime rate, 0.5% premium above Fed funds rate, and one-month LIBOR plus 1.00%           EITHER 1) one-month, three-month, or six-month London interbank offered rate (LIBOR) OR 2) highest of Citibank prime rate, 0.5% premium above Fed funds rate, and one-month LIBOR plus 1.00%                            
Credit agreement - basis spread of variable rate                     0.56% 0.67% 0.90% 2.00%     0.595% 0.71% 0.95% 2.00%                    
Credit agreement - minimum borrowing capacity                   0           0                            
Credit agreement - amendment date                   December 2011         January 2012 December 2011                            
Credit agreement - term                   4 years           364 days                            
Credit agreement - maximum borrowing capacity                   5,000         3,000 5,000                            
Credit agreement - additional borrowing capacity beyond current limit                   2,000                                        
Credit agreement - advances outstanding                   0           0                            
Ratio of debt to EBITDA covenant                   3.0           3.0                            
Agreement termination date                                                         December 2011  
Credit agreement - change in control period (months)                    24            24                            
Repayments of short-term bank borrowings 27                                                          
Total repayments of debt $ 9,226