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Stockholders' Equity (Share Repurchase Program) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | 23 Months Ended | 35 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2016 | Jul. 28, 2015 | Jan. 21, 2015 | Jan. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock | $ 916 | $ 2,353 | $ 2,000 |  |  |  |  |
Repurchased and retired, shares | 13,152,000 | 39,564,000 | 30,110,000 |  |  |  |  |
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 |  |
Payments for Repurchase of Common Stock |  |  |  | $ 2,916 |  |  |  |
Repurchased and retired, shares |  |  |  | 48,200,000 |  |  |  |
YTD 2016 Open Market Purchases [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock | $ 916 |  |  |  |  |  |  |
Repurchased and retired, shares | 13,200,000 |  |  |  |  |  |  |
January 2014 Buyback Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share buyback plan, authorized amount |  |  |  |  |  |  |  | $ 5,000
Payments for Repurchase of Common Stock |  |  | $ 2,000 |  | $ 2,353 |  |  |
Repurchased and retired, shares |  |  | 30,100,000 |  | 34,700,000 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 2,647 |  |  | $ 2,647 | $ 2,647 |  |  |
YTD 2015 Open Market Purchases [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 353 |  |  |  |  |  |
Repurchased and retired, shares |  | 4,600,000 |  |  |  |  |  |

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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=66902209&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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