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Background and Basis of Presentation (Share Repurchase Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Repurchase of common stock, shares | 2.8 | 3.6 |
Repurchases of common stock, value | $ 168 | $ 192 | $ 554
Average price of repurchased shares, per share | $ 59.81 | $ 53.03 |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: 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 + Details
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