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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
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jul. 25, 2013 Subsequent Event [Member] Dividend Declared [Member] | Jun. 30, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2012 Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2013 Shares Purchased Under Programs [Member] | Jun. 30, 2012 Shares Purchased Under Programs [Member] | Jun. 30, 2013 Parent [Member] | Jun. 30, 2012 Parent [Member] | Jun. 30, 2013 Parent [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2012 Parent [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2013 Parent [Member] Shares Purchased Under Programs [Member] | Jun. 30, 2012 Parent [Member] Shares Purchased Under Programs [Member] | Jun. 30, 2013 Common Stock [Member] | Jun. 30, 2012 Common Stock [Member] | Jun. 30, 2013 Treasury Stock [Member] | Jun. 30, 2012 Treasury Stock [Member] | Jun. 30, 2013 Treasury Stock [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2012 Treasury Stock [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2013 Treasury Stock [Member] Shares Purchased Under Programs [Member] | Jun. 30, 2012 Treasury Stock [Member] Shares Purchased Under Programs [Member] | Jun. 30, 2013 Noncontrolling Interest [Member] | Jun. 30, 2012 Noncontrolling Interest [Member] | Jun. 30, 2013 Noncontrolling Interest [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2012 Noncontrolling Interest [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2013 Noncontrolling Interest [Member] Shares Purchased Under Programs [Member] | Jun. 30, 2012 Noncontrolling Interest [Member] Shares Purchased Under Programs [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | $ 18,095 | $ 16,445 |  |  |  |  |  | $ 18,032 | $ 16,423 |  |  |  |  |  |  |  |  |  |  |  |  | $ 63 | $ 22 |  |  |  |
Net income (loss) | 465 | 830 | 1,117 | 398 |  |  |  |  |  | 1,120 | 399 |  |  |  |  |  |  |  |  |  |  |  |  | (3) | (1) |  |  |  |
Dividends |  |  | (220) | (166) |  |  |  |  |  | (220) | (166) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Stock-based compensation expense |  |  | 25 | 20 |  |  |  |  |  | 25 | 20 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Tax deduction in excess of stock-based compensation expense |  |  | 27 | 3 |  |  |  |  |  | 27 | 3 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  | 43 | 11 |  |  |  |  |  | 43 | 11 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Stock repurchases |  |  |  |  |  | (196) | (136) | (364) | 0 |  |  | (196) | (136) | (364) | 0 |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Separation of retail business |  |  | (499) | 0 |  |  |  |  |  | (499) | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Contributions from noncontrolling interests |  |  | 45 | 25 |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 45 | 25 |  |  |  |
Other comprehensive income (loss) | (61) | (102) | (48) | 23 |  |  |  |  |  | (48) | 23 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Balance as of end of period | $ 18,025 | $ 16,623 | $ 18,025 | $ 16,623 |  |  |  |  |  | $ 17,920 | $ 16,577 |  |  |  |  |  |  |  |  |  |  |  |  | $ 105 | $ 46 |  |  |  |
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares, beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares, beginning balance |  |  | (121,406,520) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (121,000,000) | (117,000,000) |  |  |  |  |  |  |  |  |  |
Stock issuances, stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |
Stock purchases, stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,000,000) | (6,000,000) | (8,000,000) | 0 |  |  |  |  |  |
Common stock, shares, ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, shares, ending balance | (131,412,237) |  | (131,412,237) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (131,000,000) | (122,000,000) |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  |  |  | Jul. 25, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share |  |  |  |  | $ 0.225 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  |  |  |  | Sep. 11, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record |  |  |  |  | Aug. 14, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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