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Earnings Per Share (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2011 | Dec. 31, 2011
Earnings Per Share [Abstract] |  |  |  |
Shares issued related to equity unit conversion (in shares) | 44 |  |  |
Face amount of equity units |  | $ 1,750,000,000 |  | $ 1,750,000,000
Adjustment for after-tax interest |  |  | $ 13,000,000 |
Interest rate stated percentage |  |  |  | 4.70%
Shares assumed issued included in adjusted average shares outstanding |  | 44 | 11 |

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