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Stockholders' Equity (Share Repurchase Program) (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 20 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Jul. 28, 2015 | Jan. 21, 2015 | Jan. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Prepayments / repurchase of common stock |  | $ 2,353 | $ 2,000 |  |  |  |
January 2014 Buyback Plan [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Share buyback plan, Authorized Amount |  |  |  |  |  |  | $ 5,000
Repurchased and retired, shares |  |  |  | 34.7 |  |  |
Repurchase of common stock |  |  |  | $ 2,353 |  |  |
YTD 2015 Open Market Purchases [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchased and retired, shares |  | 4.6 |  |  |  |  |
Repurchase of common stock |  | $ 353 |  |  |  |  |
2015 Share Buyback Plan [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Share buyback plan, Authorized Amount |  |  |  |  | $ 2,000 |  |
Prepayments / repurchase of common stock | $ 2,000 |  |  |  |  |  |
Repurchased and retired, shares | 28.8 |  |  |  |  |  |
Percentage of share repurchase agreement completed | 80.00% | 80.00% |  | 80.00% |  |  |
2015 Share buyback announcement |  |  |  |  |  | $ 4,000 |

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