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Stockholders' Equity (Share Repurchase Program) (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 15 Months Ended | 26 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2016 | Jul. 28, 2015 | Jan. 21, 2015 | Jan. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock | $ 0 | $ 282 |  |  |  |  |
January 2014 Buyback Plan [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Share buyback plan, Authorized Amount |  |  |  |  |  |  | $ 5,000
Repurchased and retired, shares | 0.0 |  |  | 34.7 |  |  |
Repurchase of common stock | $ 0 |  |  | $ 2,353 |  |  |
YTD 2015 Open Market Purchases [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchased and retired, shares |  | 3.6 |  |  |  |  |
Repurchase of common stock |  | $ 282 |  |  |  |  |
2015 Share Buyback Plan [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
2015 Share buyback announcement |  |  |  |  |  | $ 4,000 |
Share buyback plan, Authorized Amount |  |  |  |  | $ 2,000 |  |
Repurchased and retired, shares | 0.0 |  | 35.0 |  |  |  |
Repurchase of common stock | $ 0 |  | $ 2,000 |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + 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=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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