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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jul. 26, 2012 Dividend Declared [Member] | Jun. 30, 2012 Common Stock [Member] | Jun. 30, 2011 Common Stock [Member] | Jun. 30, 2012 Treasury Stock [Member] | Jun. 30, 2011 Treasury Stock [Member] | Jun. 30, 2012 Parent [Member] | Jun. 30, 2011 Parent [Member] | Jun. 30, 2012 Noncontrolling Interest [Member] | Jun. 30, 2011 Noncontrolling Interest [Member]
Reconciliation of the beginning and ending balances of the carrying amount of equity |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | $ 16,445 | $ 15,025 |  |  |  |  |  | $ 16,423 | $ 15,025 | $ 22 | $ 0
Net income (loss) | 830 | 743 | 398 | 841 |  |  |  |  |  | 399 | 842 | (1) | (1)
Dividends |  |  | (166) | (57) |  |  |  |  |  | (166) | (57) | 0 | 0
Stock-based compensation expense |  |  | 20 | 23 |  |  |  |  |  | 20 | 23 | 0 | 0
Tax deduction in excess of stock-based compensation expense |  |  | 3 | 11 |  |  |  |  |  | 3 | 11 | 0 | 0
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  | 11 | 30 |  |  |  |  |  | 11 | 30 | 0 | 0
Stock repurchases |  |  | (136) | (2) |  |  |  |  |  | (136) | (2) | 0 | 0
Contributions from noncontrolling interest |  |  | 25 | 11 |  |  |  |  |  | 0 | 0 | 25 | 11
Other comprehensive income | (102) | 19 | 23 | 110 |  |  |  |  |  | 23 | 110 | 0 | 0
Balance as of end of period | $ 16,623 | $ 15,992 | $ 16,623 | $ 15,992 |  |  |  |  |  | $ 16,577 | $ 15,982 | $ 46 | $ 10
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 |  |  |  |  |  |  |  | (6,000,000) | 0 |  |  |  |
Common stock, shares, ending balance |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |
Treasury Stock, shares, ending balance | 122,106,373 |  | 122,106,373 |  |  |  |  | (122,000,000) | (103,000,000) |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  |  |  | Jul. 26, 2012 |  |  |  |  |  |  |  |
Dividends payable, amount per share |  |  |  |  | $ 0.175 |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  |  |  |  | Sep. 12, 2012 |  |  |  |  |  |  |  |
Dividends payable, date of record |  |  |  |  | Aug. 15, 2012 |  |  |  |  |  |  |  |

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