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Quarterly Results (Unaudited) Level 1 (Notes) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] |
| Three months ended
| March 31, | June 30, | September 30, | December 31,
| 2016 | 2015 | 2016 | 2015 | 2016 | 2015 | 2016 | 2015
Revenues | $ | 4,391 |  | $ | 4,617 |  | $ | 4,677 |  | $ | 4,685 |  | $ | 4,695 |  | $ | 4,562 |  | $ | 4,537 |  | $ | 4,513 |
Benefits, losses and expenses | $ | 4,010 |  | $ | 3,992 |  | $ | 4,507 |  | $ | 4,215 |  | $ | 4,167 |  | $ | 4,183 |  | $ | 4,812 |  | $ | 4,009 |
Income (loss) from continuing operations, net of tax | $ | 323 |  | $ | 467 |  | $ | 216 |  | $ | 413 |  | $ | 438 |  | $ | 372 |  | $ | (81 | ) | $ | 421 |
Income from discontinued operations, net of tax | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 9 |  | $ | — |  | $ | — |
Net income (loss) | $ | 323 |  | $ | 467 |  | $ | 216 |  | $ | 413 |  | $ | 438 |  | $ | 381 |  | $ | (81 | ) | $ | 421 |
Basic earnings (losses) per common share | $ | 0.81 |  | $ | 1.11 |  | $ | 0.55 |  | $ | 0.99 |  | $ | 1.14 |  | $ | 0.92 |  | $ | (0.22 | ) | $ | 1.03 |
Diluted earnings (losses) per common share | $ | 0.79 |  | $ | 1.08 |  | $ | 0.54 |  | $ | 0.96 |  | $ | 1.12 |  | $ | 0.90 |  | $ | (0.22 | ) | $ | 1.01 |
Weighted average common shares outstanding, basic | 398.5 |  | 422.6 |  | 391.8 |  | 418.7 |  | 383.8 |  | 413.8 |  | 376.6 |  | 406.9 |
Weighted average shares outstanding and dilutive potential common shares | 406.3 |  | 433.7 |  | 398.6 |  | 428.1 |  | 390.5 |  | 423.0 |  | 383.8 |  | 415.9 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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