v2.4.0.6
Marketable Securities Available for Sales and Trading (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Mar. 31, 2012
Level 1 [Member]
Dec. 31, 2011
Level 1 [Member]
Mar. 31, 2012
Level 2 [Member]
Dec. 31, 2011
Level 2 [Member]
Mar. 31, 2012
Level 3 [Member]
Dec. 31, 2011
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Level 1 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Level 1 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Level 2 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Level 2 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Level 3 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Level 1 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Level 1 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Level 2 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Level 2 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
US government and agencies [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Level 1 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Level 1 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Level 2 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Level 2 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Sovereign debt [Member]
Level 3 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Level 1 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Level 1 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Level 2 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Level 2 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Certificates of Deposit [Member]
Level 3 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Level 1 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Level 1 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Level 2 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Level 2 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Money Market Funds [Member]
Level 3 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Level 1 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Level 1 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Level 2 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Level 2 [Member]
Mar. 31, 2012
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Commercial Paper [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Level 1 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Level 2 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Level 3 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
US government and agencies [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
US government and agencies [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
US government and agencies [Member]
Level 1 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
US government and agencies [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
US government and agencies [Member]
Level 2 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
US government and agencies [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
US government and agencies [Member]
Level 3 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
US government and agencies [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Sovereign debt [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Sovereign debt [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Sovereign debt [Member]
Level 1 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Sovereign debt [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Sovereign debt [Member]
Level 2 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Sovereign debt [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Sovereign debt [Member]
Level 3 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Sovereign debt [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Level 1 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Level 2 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Level 3 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Certificates of Deposit [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Corporate Debt [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Corporate Debt [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Corporate Debt [Member]
Level 1 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Corporate Debt [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Corporate Debt [Member]
Level 2 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Corporate Debt [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Corporate Debt [Member]
Level 3 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Corporate Debt [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Equity [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Equity [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Equity [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Equity [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Equity [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Other Debt [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Other Debt [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Other Debt [Member]
Level 1 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Other Debt [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Other Debt [Member]
Level 2 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Other Debt [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Current [Member]
Other Debt [Member]
Level 3 [Member]
Dec. 31, 2011
Marketable Securities - Current [Member]
Other Debt [Member]
Level 3 [Member]
Mar. 31, 2012
Marketable Securities - Noncurrent [Member]
Mar. 31, 2012
Marketable Securities - Noncurrent [Member]
Equity [Member]
Mar. 31, 2012
Marketable Securities - Noncurrent [Member]
Equity [Member]
Level 1 [Member]
Mar. 31, 2012
Marketable Securities - Noncurrent [Member]
Equity [Member]
Level 2 [Member]
Mar. 31, 2012
Marketable Securities - Noncurrent [Member]
Equity [Member]
Level 3 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Level 1 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Level 1 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Level 2 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Level 2 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Level 3 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Level 3 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Level 1 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Level 1 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Level 2 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Level 2 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Level 3 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Sovereign debt [Member]
Level 3 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Level 1 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Level 1 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Level 2 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Level 2 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Level 3 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Money Market Funds [Member]
Level 3 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Level 1 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Level 1 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Level 2 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Level 2 [Member]
Mar. 31, 2012
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Level 3 [Member]
Dec. 31, 2011
Restricted cash and cash equivalent [Member]
Other restricted marketable securities [Member]
Level 3 [Member]
Available For Sale and Trading Securities [Line Items]                                                                                                                                                                                                                                                                                                            
Available-for-sale Securities, Amortized Cost $ 19,041                 $ 9,663 $ 11,980             $ 5,001 $ 239             $ 490 $ 380             $ 438 $ 2,028             $ 981 $ 1,794             $ 5,180 $ 5,112             $ 8,001 $ 10,101             $ 3,622 $ 5,214             $ 77 $ 143             $ 42 $ 178             $ 4,260 $ 4,566                                             $ 404 $ 404       $ 1,443 $ 1,539             $ 16 $ 15             $ 1,264 $ 1,363             $ 163 $ 161            
Available-for-sale Securities, Gross Unrealized Gains                   0 0             0 0             0 0             0 0             0 0             0 0             7 5             1 2             1 0             0 0             5 3                                             0 0       0 3             0 0             0 0             0 3            
Available-for-sale Securities, Gross Unrealized Losses                   0 0             0 0             0 0             0 0             0 0             0 0             3 4             0 0             0 0             0 0             3 4                                             5 5       0 0             0 0             0 0             0 0            
Available-for-sale Securities, Fair Value 19,046                 9,663     1,794   7,869   0 5,001 239 0 0 5,001 239 0 0 490 380 0 0 380 490 0 0 438 2,028 0 0 438 2,028 0 0 981 1,794 981 1,794 0 0 0 0 5,180 5,112 0 0 5,180 5,112 0 0 8,005 10,102 0 0 8,005 10,102 0 0 3,623 5,216 0 0 3,623 5,216 0 0 78 143 0 0 78 143 0 0 42 178 0 0 42 178 0 0 4,262 4,565 0 0 4,262 4,565 0 0                                   399 399 0 0 1,443 1,542 1,264 1,363 179 179 0 0 16 15 0 0 16 15 0 0 1,264 1,363 1,264 1,363 0 0 0 0 163 164 0 0 163 164 0 0
Total Marketable Securities, Noncurrent 399     399   0   0                                                                                                                                                                                                                                                                                            
Total Marketable Securities 15,085     438   14,647   0                                                                                                                                                                                                                                                                                            
Trading Securities, Unrealized Holding Gain                   8                               8                                                               97 19                             91 18                                             5 0             1 1                                                                                      
Trading Securities, Unrealized Holding Loss                   0                               0                                                               8 40                             8 33                                             0 5             0 2                                                                                      
Trading Securities, Fair Value                   497     0   497   0                 497     0   497   0                                                 6,681 6,046 39 34 6,642 6,012 0 0                 6,565 5,936 0 0 6,565 5,936 0 0                                 39 34 39 34 0 0 0 0 77 76 0 0 77 76 0 0                                                                          
Total marketable securities classified as cash equivalent, fair value                   10,160 11,980 981 1,794 10,999 8,366 0 0                                                                                                                                                                                                                                                                          
Cash, time deposits, and other cash equivalents 5,398   5,911                                                                                                                                                                                                                                                                                                      
Total Cash and Cash Equivalents 17,378   16,071                                                                                                                                                                                                                                                                                                      
Total Marketable Securities - Current 14,686   16,148 39 34 14,647 16,114 0 0                                                                                                                                                                                                                                                                                          
Total Restricted Cash and Marketable Securities 2,075   2,233                                                                                                                                                                                                                                                                                                      
Restricted Cash - Other 632   691                                                                                                                                                                                                                                                                                                      
Restricted Cash and Investments, Current 924   1,005                                                                                                                                                                                                                                                                                                      
Restricted Cash and Investments, Noncurrent 1,151   1,228                                                                                                                                                                                                                                                                                                      
Trading Securities Pledged as Collateral 84   84                                                                                                                                                                                                                                                                                                      
Letters of Credit Outstanding Amount 70   70                                                                                                                                                                                                                                                                                                      
Available-for-sale Securities Sale Proceeds 427 117                                                                                                                                                                                                                                                                                                        
Available-for-sale Securities, Due in One Year, Amortized Cost 16,897                                                                                                                                                                                                                                                                                                          
Available-for-sale Securities, Due after One Through Five Years, Amortized Cost 2,144                                                                                                                                                                                                                                                                                                          
Available-for-sale Securities, Due in One Year, Fair Value 16,898                                                                                                                                                                                                                                                                                                          
Available-for-sale Securities, Due after One Through Five Years, Fair Value $ 2,148