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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Reconciliation of the beginning and ending balances of the carrying amount of equity |  |  |  |
Balance as of beginning of period |  |  | $ 16,445 | $ 15,025
Net income (loss) | 673 | 1,203 | 1,071 | 2,044
Dividends |  |  | (263) | (85)
Stock-based compensation expense |  |  | 29 | 34
Tax deduction in excess of stock-based compensation expense |  |  | 16 | 19
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock issuances |  |  | 36 | 42
Stock repurchases |  |  | (138) | (270)
Contributions from noncontrolling interest |  |  | 34 | 14
Recognition of noncontrolling interest in connection with Pembroke Acquisition |  |  | 0 | 3
Other comprehensive income (loss) | 133 | (266) | 156 | (156)
Balance as of end of period | 17,386 | 16,670 | 17,386 | 16,670
Share Activity Rollforward |  |  |  |
Treasury stock, shares, beginning balance |  |  | (116,689,450) |
Treasury Stock, shares, ending balance | (120,035,210) |  | (120,035,210) |
Common Stock [Member] |  |  |  |
Share Activity Rollforward |  |  |  |
Common stock, shares, beginning balance |  |  | 673,000,000 | 673,000,000
Stock issuances, stock-based compensation |  |  | 0 | 0
Common stock, shares, ending balance | 673,000,000 | 673,000,000 | 673,000,000 | 673,000,000
Treasury Stock [Member] |  |  |  |
Share Activity Rollforward |  |  |  |
Treasury stock, shares, beginning balance |  |  | (117,000,000) | (105,000,000)
Stock issuances, stock-based compensation |  |  | 3,000,000 | 4,000,000
Stock purchases, stock-based compensation |  |  | (6,000,000) | (14,000,000)
Treasury Stock, shares, ending balance | (120,000,000) | (115,000,000) | (120,000,000) | (115,000,000)
Parent [Member] |  |  |  |
Reconciliation of the beginning and ending balances of the carrying amount of equity |  |  |  |
Balance as of beginning of period |  |  | 16,423 | 15,025
Net income (loss) |  |  | 1,073 | 2,045
Dividends |  |  | (263) | (85)
Stock-based compensation expense |  |  | 29 | 34
Tax deduction in excess of stock-based compensation expense |  |  | 16 | 19
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock issuances |  |  | 36 | 42
Stock repurchases |  |  | (138) | (270)
Contributions from noncontrolling interest |  |  | 0 | 0
Recognition of noncontrolling interest in connection with Pembroke Acquisition |  |  | 0 | 0
Other comprehensive income (loss) |  |  | 156 | (156)
Balance as of end of period | 17,332 | 16,654 | 17,332 | 16,654
Noncontrolling Interest [Member] |  |  |  |
Reconciliation of the beginning and ending balances of the carrying amount of equity |  |  |  |
Balance as of beginning of period |  |  | 22 | 0
Net income (loss) |  |  | (2) | (1)
Dividends |  |  | 0 | 0
Stock-based compensation expense |  |  | 0 | 0
Tax deduction in excess of stock-based compensation expense |  |  | 0 | 0
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock issuances |  |  | 0 | 0
Stock repurchases |  |  | 0 | 0
Contributions from noncontrolling interest |  |  | 34 | 14
Recognition of noncontrolling interest in connection with Pembroke Acquisition |  |  | 0 | 3
Other comprehensive income (loss) |  |  | 0 | 0
Balance as of end of period | $ 54 | $ 16 | $ 54 | $ 16

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