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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
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,537 | $ 4,695 | $ 4,677 | $ 4,391 | $ 4,513 | $ 4,562 | $ 4,685 | $ 4,617 | $ 18,300 | $ 18,377 | $ 18,614
Benefits, Losses and Expenses | 4,812 | 4,167 | 4,507 | 4,010 | 4,009 | 4,183 | 4,215 | 3,992 | 17,496 | 16,399 | 16,915
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | (81) | 438 | 216 | 323 | 421 | 372 | 413 | 467 | 896 | 1,673 | 1,349
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 0 | 0 | 0 | 0 | 0 | 9 | 0 | 0 | 0 | 9 | (551)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ (81) | $ 438 | $ 216 | $ 323 | $ 421 | $ 381 | $ 413 | $ 467 | $ 896 | $ 1,682 | $ 798
Earnings Per Share, Basic | $ (0.22) | $ 1.14 | $ 0.55 | $ 0.81 | $ 1.03 | $ 0.92 | $ 0.99 | $ 1.11 | $ 2.31 | $ 4.05 | $ 1.81
Earnings Per Share, Diluted | $ (0.22) | $ 1.12 | $ 0.54 | $ 0.79 | $ 1.01 | $ 0.90 | $ 0.96 | $ 1.08 | $ 2.27 | $ 3.96 | $ 1.73
Weighted Average Number of Shares Outstanding, Basic | 376.6 | 383.8 | 391.8 | 398.5 | 406.9 | 413.8 | 418.7 | 422.6 | 387.7 | 415.5 | 441.8
Weighted Average Number of Shares Outstanding, Diluted | 383.8 | 390.5 | 398.6 | 406.3 | 415.9 | 423.0 | 428.1 | 433.7 | 394.8 | 425.2 | 460.2

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