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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended | 1 Months Ended | 2 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | May 03, 2012 Dividend Declared [Member] | May 23, 2012 Dividend Declared [Member] | Jun. 20, 2012 Dividend Declared [Member] | Mar. 31, 2012 Common Stock [Member] | Mar. 31, 2011 Common Stock [Member] | Mar. 31, 2012 Treasury Stock [Member] | Mar. 31, 2011 Treasury Stock [Member] | Mar. 31, 2012 Parent [Member] | Mar. 31, 2011 Parent [Member] | Mar. 31, 2012 Noncontrolling Interest [Member] | Mar. 31, 2011 Noncontrolling Interest [Member]
Reconciliation of the beginning and ending balances of the carrying amount of equity |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ 16,445 | $ 15,025 |  |  |  |  |  |  |  | $ 16,423 | $ 15,025 | $ 22 | $ 0
Net income (loss) | (432) | 98 |  |  |  |  |  |  |  | (432) | 98 | 0 | 0
Dividends | (83) | (28) |  |  |  |  |  |  |  | (83) | (28) | 0 | 0
Stock-based compensation expense | 10 | 12 |  |  |  |  |  |  |  | 10 | 12 | 0 | 0
Tax deduction in excess of stock-based compensation expense | 2 | 5 |  |  |  |  |  |  |  | 2 | 5 | 0 | 0
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances | 9 | 21 |  |  |  |  |  |  |  | 9 | 21 | 0 | 0
Stock repurchases | (95) | 0 |  |  |  |  |  |  |  | (95) | 0 | 0 | 0
Contributions from noncontrolling interest | 11 | 0 |  |  |  |  |  |  |  | 0 | 0 | 11 | 0
Other comprehensive income | 125 | 91 |  |  |  |  |  |  |  | 125 | 91 | 0 | 0
Balance at end of period | $ 15,992 | $ 15,224 |  |  |  |  |  |  |  | $ 15,959 | $ 15,224 | $ 33 | $ 0
Share Activity Rollforward |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares, beginning balance |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |
Treasury stock, shares, beginning balance | (116,689,450) |  |  |  |  |  |  | (117,000,000) | (105,000,000) |  |  |  |
Stock issuances, stock-based compensation |  |  |  |  |  | 0 | 0 | 1,000,000 | 2,000,000 |  |  |  |
Stock purchases, stock-based compensation |  |  |  |  |  |  |  | (5,000,000) | 0 |  |  |  |
Common stock, shares, ending balance |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |
Treasury Stock, shares, ending balance | (120,526,015) |  |  |  |  |  |  | (121,000,000) | (103,000,000) |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  | May 03, 2012 |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share |  |  |  |  | $ 0.15 |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  |  |  |  | Jun. 20, 2012 |  |  |  |  |  |  |  |
Dividends payable, date of record |  |  |  | May 23, 2012 |  |  |  |  |  |  |  |  |

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- Definition Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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