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Equity Level 3 (Table) (Tables) | 9 Months Ended
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Sep. 30, 2016
Equity [Abstract] |
Class of Treasury Stock [Table Text Block] |
Equity Repurchase Activity and Remaining Repurchase Capacity
Three months ended | Common Shares Repurchased | Cost of Shares Repurchased | Average Price Paid per Share | Remaining Capacity Under Share Repurchase Authorization
(In millions, except for per share data) |  |  |  |
March 31, 2017 | 6.7 |  | $ | 325 |  | $ | 48.47 |  | $ | 975 |
June 30, 2017 | 6.6 |  | $ | 325 |  | $ | 49.34 |  | $ | 650 |
September 30, 2017 | 6.0 |  | $ | 325 |  | $ | 54.35 |  | $ | 325 |
Total | 19.3 |  | $ | 975 |  |  |  |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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