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Equity, Stock Related Disclosures (Details) (USD $) | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Feb. 28, 2008 | Dec. 31, 2013 | Dec. 31, 2013 Approvals Under Program One [Member] | Dec. 31, 2013 Approvals Under Program Two [Member] | Dec. 31, 2013 Shares Purchased Under Programs, Cost [Member] | Dec. 31, 2012 Shares Purchased Under Programs, Cost [Member] | Jan. 22, 2014 Subsequent Event [Member] Dividend Declared [Member] | Dec. 31, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Dec. 31, 2013 Common Stock [Member] Shares Purchased Under Programs, Cost [Member] | Dec. 31, 2012 Common Stock [Member] Shares Purchased Under Programs, Cost [Member] | Dec. 31, 2013 Treasury Stock [Member] | Dec. 31, 2012 Treasury Stock [Member] | Dec. 31, 2011 Treasury Stock [Member] | Dec. 31, 2013 Treasury Stock [Member] Shares Purchased Under Programs, Cost [Member] | Dec. 31, 2012 Treasury Stock [Member] Shares Purchased Under Programs, Cost [Member] | Dec. 31, 2011 Treasury Stock [Member] Shares Purchased Under Programs, Cost [Member] | Jan. 31, 2014 Treasury Stock [Member] Subsequent Event [Member] Shares Purchased Under Programs, Cost [Member] | Dec. 31, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] Treasury Stock [Member] | Dec. 31, 2012 Shares Purchased Related To Stock-Based Compensation Plans [Member] Treasury Stock [Member] | Dec. 31, 2011 Shares Purchased Related To Stock-Based Compensation Plans [Member] Treasury Stock [Member] | Dec. 31, 2013 Shares Purchased Under Programs [Member] Treasury Stock [Member] | Dec. 31, 2012 Shares Purchased Under Programs [Member] Treasury Stock [Member] | Jan. 31, 2014 Shares Purchased Under Programs [Member] Treasury Stock [Member] Subsequent Event [Member]
Share Activity Rollforward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Beginning Balance |  |  |  |  |  |  |  | 673,000,000 | 673,000,000 | 673,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Beginning Balance |  | (121,406,520) |  |  |  |  |  |  |  |  |  |  | (121,000,000) | (117,000,000) | (105,000,000) |  |  |  |  |  |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  | 6,000,000 | 6,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,000,000) | (6,000,000) | (17,000,000) | (17,000,000) | (4,000,000) | (4,000,000)
Common Stock, Ending Balance |  |  |  |  |  |  |  | 673,000,000 | 673,000,000 | 673,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Ending Balance |  | (137,932,138) |  |  |  |  |  |  |  |  |  |  | (138,000,000) | (121,000,000) | (117,000,000) |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value per share |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock purchase program, date approved | Feb. 28, 2008 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount under stock purchase program |  |  | $ 6,000,000,000 | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases under buyback program |  |  |  |  | 692,000,000 | 118,000,000 |  |  |  |  | 0 | 0 |  |  |  | 692,000,000 | 118,000,000 | 0 | 208,000,000 |  |  |  |  |  |
Remaining amount authorized under stock purchase programs |  | $ 2,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 6,000,000 | 17,000,000 | 17,000,000 | 4,000,000 | 4,000,000
Dividends payable, date declared |  |  |  |  |  |  | Jan. 22, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share |  |  |  |  |  |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  |  |  |  |  |  | Mar. 12, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record |  |  |  |  |  |  | Feb. 12, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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