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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 | 6 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Repurchase of common stock (shares) | 14.4 | 2.7 | 22.1 | 5.5 |
Aggregate cost of shares repurchased | $ 1,049 | $ 173 | $ 1,600 | $ 341 | $ 1,030
Average price of repurchased shares, per share (usd per share) | $ 72.85 | $ 64.06 | $ 72.47 | $ 61.90 |

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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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