| **Stock-Based Compensation And Employee Benefit Plans Stock-Based Compensation and Employee Benefits Plans (Schedule of Share Repurchases) (Details) (USD $)In Millions, except Share data in Thousands, unless otherwise specified** | 12 Months Ended | 17 Months Ended |
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| **Equity [Abstract]**                                                                                                                                                                                                                 |            |            |   |
| Stock Repurchased and Retired During Period, Value                                                                                                                                                                                    |            | $ (471)         |   |
| February 2011 Repurchase Program [Member]                                                                                                                                                                                             |            |            |   |
| **Equity [Abstract]**                                                                                                                                                                                                                 |            |            |   |
| Stock repurchased and retired during period, Shares                                                                                                                                                                                   | 4,000           | 25,000          | 32,000 |
| Stock Repurchased and Retired During Period, Value                                                                                                                                                                                    | (71)            | (471)           |   |
| July 2012 Repurchase Program [Member]                                                                                                                                                                                                 |            |            |   |
| **Equity [Abstract]**                                                                                                                                                                                                                 |            |            |   |
| Stock repurchased and retired during period, Shares                                                                                                                                                                                   | 22,000          |            |   |
| Stock Repurchased and Retired During Period, Value                                                                                                                                                                                    | (278)           |            |   |
| Repurchase Program, Total [Member]                                                                                                                                                                                                    |            |            |   |
| **Equity [Abstract]**                                                                                                                                                                                                                 |            |            |   |
| Stock repurchased and retired during period, Shares                                                                                                                                                                                   | 26,000          | 25,000          |   |
| Stock Repurchased and Retired During Period, Value                                                                                                                                                                                    | $ 349           | $ (471)         |   |

| X                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased and retired during the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5
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