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Financings and Capitalization (Contingently Convertible Securities) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
Number of trading days, adjusted trigger price contingencies were met | 20 |
Number of trading days | 30 |
Conversion Price Adjustment Trigger | 1.00% |
Debt Issuance, Principal | $ 7,093,000,000 | $ 7,206,000,000
2.875% Senior Notes [Member] |  |
Maturity Date | 2024 |
Outstanding | 226,000,000 |
Adjusted Conversion Price | $ 12.54 |
Adjusted Trigger Price | $ 15.04 |
Senior Notes Interest Rate | 2.875% |
5.50% Senior Notes [Member] |  |
Maturity Date | 2029 |
Outstanding | 172,000,000 |
Adjusted Conversion Price | $ 14.08 |
Adjusted Trigger Price | $ 18.31 |
Trigger Price As Percent Of Conversion Price | 130.00% |
Senior Notes Interest Rate | 5.50% |
3.375% Contingently Convertible Senior Notes due 2023 [Member] |  |
Senior Notes Interest Rate | 3.375% |
Conversion Date | January 2011 |
Principal Converted | 4,000,000 |
Conversion Value per share of principal | 1,994.21 |
Common Stock Issued on Settlement | 197,472 |
Cash Paid on Settlement | 4,000,000 |
2.875% Convertible Senior Notes Due 2024 [Member] |  |
Trigger Price As Percent Of Conversion Price | 120.00% |
Senior Notes Interest Rate | 2.875% |
Conversion Date | December 2011 |
Principal Converted | 62,000,000 |
Conversion Value per share of principal | 1,654.13 |
Common Stock Issued on Settlement | 1,954,542 |
Cash Paid on Settlement | 62,000,000 |
Repayment of Debt [Member] | 2.875% Convertible Senior Notes Due 2024 [Member] |  |
Senior Notes Interest Rate | 2.875% |
Conversion Date | January 2012 |
Principal Converted | 73,000,000 |
Conversion Value per share of principal | 1,738.99 |
Common Stock Issued on Settlement | 2,464,138 |
Cash Paid on Settlement | 73,000,000 |
Debt Issuance, Principal | $ 1,000 |

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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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