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Capital Stock (Schedule of Shares Repurchased) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |
Total number of shares repurchased (in shares) | 41,604,141 | 16,221,001 | 10,682,419
Aggregate cost of shares repurchased | $ 2,917 | $ 1,030 | $ 554
Average price per share of shares repurchased (USD per share) | $ 70.10 | $ 63.48 | $ 51.83

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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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