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Equity Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended | 66 Months Ended | 68 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 11, 2015 | Oct. 31, 2015 | Feb. 23, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Feb. 23, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  | $ 0.10 | $ 0.1 | $ 0.1 | $ 0.10 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 |  |  |  |  |
Dividends declared on common stock (per share amount) | $ 0.11 |  |  | $ 0.21 | $ 0.1 | $ 0.1 | $ 0 | $ 0.15 | $ 0.05 | $ 0.05 | $ 0 | $ 0.41 | $ 0.25 | $ 0.17 |  |
Stock repurchase program, additional authorized amount |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 1,800 |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  |  |  |  | $ 482 | $ 308 | $ 322 |  |
Acquisition of treasury stock (shares) |  |  |  |  |  |  |  |  |  |  |  | 39,700,000 |  |  | 145,600,000 |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.31 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 343 |  |  |  |  |  |  |  | $ 343 |  |  | $ 343 |
Treasury stock, shares (in shares) |  |  |  | 149,037,831 |  |  |  | 110,687,849 |  |  |  | 149,037,831 | 110,687,849 |  | 149,037,831 |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 2,100 |  |  |  |  |  |  |  | $ 2,100 |  |  | $ 2,100 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 79 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900
Acquisition of treasury stock (shares) |  |  | 8,700,000 |  |  |  |  |  |  |  |  |  |  |  |  | 154,300,000
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.12
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 264 |  |  |  |  |  |  |  |  |  |  |  |  | $ 264

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