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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |
Balance as of beginning of period |  |  | $ 18,095 | $ 16,445
Net income (loss) | 324 | 673 | 1,441 | 1,071
Dividends |  |  | (342) | (263)
Stock-based compensation expense |  |  | 31 | 29
Tax deduction in excess of stock-based compensation expense |  |  | 31 | 16
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock issuances |  |  | 47 | 36
Separation of retail business |  |  | (479) | 0
Contributions from noncontrolling interests |  |  | 45 | 34
Other comprehensive income | 182 | 133 | 134 | 156
Balance as of end of period | 18,387 | 17,386 | 18,387 | 17,386
Share Activity |  |  |  |
Treasury stock, shares, beginning balance |  |  | (121,406,520) |
Treasury stock, shares, ending balance | (131,876,124) |  | (131,876,124) |
Shares Purchased Related To Stock-Based Compensation Plans [Member] |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock repurchases |  |  | (220) | (138)
Shares Purchased Under Programs [Member] |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock repurchases |  |  | (396) | 0
Parent [Member] |  |  |  |
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |
Balance as of beginning of period |  |  | 18,032 | 16,423
Net income (loss) |  |  | 1,432 | 1,073
Dividends |  |  | (342) | (263)
Stock-based compensation expense |  |  | 31 | 29
Tax deduction in excess of stock-based compensation expense |  |  | 31 | 16
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock issuances |  |  | 47 | 36
Separation of retail business |  |  | (479) | 0
Contributions from noncontrolling interests |  |  | 0 | 0
Other comprehensive income |  |  | 134 | 156
Balance as of end of period | 18,270 | 17,332 | 18,270 | 17,332
Parent [Member] | Shares Purchased Related To Stock-Based Compensation Plans [Member] |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock repurchases |  |  | (220) | (138)
Parent [Member] | Shares Purchased Under Programs [Member] |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock repurchases |  |  | (396) | 0
Common Stock [Member] |  |  |  |
Share Activity |  |  |  |
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 |  |  |  |
Treasury stock, shares, beginning balance |  |  | (121,000,000) | (117,000,000)
Stock issuances, stock-based compensation |  |  | 3,000,000 | 3,000,000
Treasury stock, shares, ending balance | (132,000,000) | (120,000,000) | (132,000,000) | (120,000,000)
Treasury Stock [Member] | Shares Purchased Related To Stock-Based Compensation Plans [Member] |  |  |  |
Share Activity |  |  |  |
Stock repurchases |  |  | (5,000,000) | (6,000,000)
Treasury Stock [Member] | Shares Purchased Under Programs [Member] |  |  |  |
Share Activity |  |  |  |
Stock repurchases |  |  | (9,000,000) | 0
Noncontrolling Interest [Member] |  |  |  |
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |
Balance as of beginning of period |  |  | 63 | 22
Net income (loss) |  |  | 9 | (2)
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
Separation of retail business |  |  | 0 | 0
Contributions from noncontrolling interests |  |  | 45 | 34
Other comprehensive income |  |  | 0 | 0
Balance as of end of period | 117 | 54 | 117 | 54
Noncontrolling Interest [Member] | Shares Purchased Related To Stock-Based Compensation Plans [Member] |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock repurchases |  |  | 0 | 0
Noncontrolling Interest [Member] | Shares Purchased Under Programs [Member] |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |
Stock repurchases |  |  | $ 0 | $ 0

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