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Quarterly Results (Unaudited) Level 4 (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,513 | $ 4,562 | $ 4,685 | $ 4,617 | $ 4,617 | $ 4,769 | $ 4,616 | $ 4,612 | $ 18,377 | $ 18,614 | $ 20,673 |
Benefits, Losses and Expenses | 4,009 | 4,183 | 4,215 | 3,992 | 4,173 | 4,273 | 4,466 | 4,003 | 16,399 | 16,915 | 19,202 |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | 421 | 372 | 413 | 467 | 345 | 388 | 150 | 466 | 1,673 | 1,349 | 1,225 |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 0 | 9 | 0 | 0 | 37 | 0 | (617) | 29 | 9 | (551) | (1,049) |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 421 | $ 381 | $ 413 | $ 467 | $ 382 | $ 388 | $ (467) | $ 495 | $ 1,682 | $ 798 | $ 176 |
Earnings Per Share, Basic | $ 1.03 | $ 0.92 | $ 0.99 | $ 1.11 | $ 0.89 | $ 0.89 | $ (1.04) | $ 1.10 | $ 4.05 | $ 1.81 | $ 0.37 |
Earnings Per Share, Diluted | $ 1.01 | $ 0.90 | $ 0.96 | $ 1.08 | $ 0.86 | $ 0.86 | $ (1.00) | $ 1.03 | $ 3.96 | $ 1.73 | $ 0.36 |
Weighted Average Number of Shares Outstanding, Basic | 406.9 | 413.8 | 418.7 | 422.6 | 429.6 | 437.2 | 450.6 | 449.8 | 415.5 | 441.8 | 447.7 |
Weighted Average Number of Shares Outstanding, Diluted | 415.9 | 423.0 | 428.1 | 433.7 | 442.6 | 450.8 | 467.9 | 478.6 | 425.2 | 460.2 | 490.6 | [1]
[1] | [1]For additional information, see Note 13 - Equity and Note 17 - Stock Compensation Plans of Notes to Consolidated Financial Statements.

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