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Significant Accounting Policies Common Stock Repurchase Program (Details) (USD $)
Share data in Millions, unless otherwise specified |
9 Months Ended | |
|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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| Significant Accounting Policies [Abstract] | ||
| Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 340,000,000 | |
| cumulative value of shares repurchased through stock repurchase program | 1,000,000,000 | |
| cumulative common stock repurchased through repurchase program | 27 | |
| Stock Repurchased During Period, Value | $ 160,000,000 | $ 91,000,000 |
| Stock Repurchased During Period, Shares | 2.7 | 2.5 |