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Share Repurchase Program - (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jul. 20, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program authorized amount |  |  |  | $ 4,000
Remaining amount available for stock repurchase |  | $ 3,500 |  |
Purchases of treasury stock (in shares) |  | 4.1 | 1.1 |
Average price paid per share (in dollars per share) |  | $ 97.70 | $ 93.24 |
Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Purchases of treasury stock (in shares) | 2.1 |  |  |
Payments to acquire shares | $ 200 |  |  |
Average price paid per share (in dollars per share) | $ 95.83 |  |  |

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- Definition The cash outflow to reacquire common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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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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