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Stockholders' Equity (Share Repurchase Program) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended | 23 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2013 | Dec. 31, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Jul. 28, 2015 | Jan. 21, 2015 | Jan. 31, 2014 | Dec. 31, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  | $ 2,353 | $ 2,000 | $ 1,000 |  |  |  |  |
Repurchased and retired, shares |  |  |  |  | 39,564,000 | 30,110,000 | 20,400,000 |  |  |  |  |
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 |  |  |  |  | $ 2,000 |  |  |  |  |  |  |
Repurchased and retired, shares |  |  |  |  | 35,000,000 |  |  |  |  |  |  |
Accelerated Share Repurchases, Final Price Paid Per Share |  |  |  |  | $ 57.16 |  |  |  |  |  |  |
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 |  |  | $ 1,000 |  |  |  |  | $ 2,353 |  |  |  |
Repurchased and retired, shares |  |  | 15,100,000 |  |  |  |  | 34,700,000 |  |  |  |
August 2014 Buyback Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 700 |  |  |  |  |  |  |  |  |  |
Repurchased and retired, shares |  | 10,400,000 |  |  |  |  |  |  |  |  |  |
Open Market Purchases [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  | $ 353 | $ 300 |  |  |  |  |  |
Repurchased and retired, shares |  |  |  |  | 4,600,000 | 4,700,000 |  |  |  |  |  |
December 2012 Buyback Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share buyback plan, authorized amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
Payments for Repurchase of Common Stock | $ 1,000 |  |  |  |  |  |  |  |  |  |  |
Repurchased and retired, shares |  |  |  | 20,400,000 |  |  |  |  |  |  |  |

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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