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Condensed Consolidated Statements of Changes in Stockholders' Equity Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions | Total | Common Stocks | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Stockholders' Equity, Total [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  | $ 10,683 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  | $ (79) |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | $ 669 |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (52) |  |  |  |
Allocated Share-based Compensation Expense | $ 53 |  |  |  |  |  |
Additional Paid in Capital at Dec. 31, 2013 |  |  | 9,894 |  |  |  |
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Tax expense on employee stock options and awards |  |  | 4 |  |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 28 |  |  | 28 |  |  |
Dividends, Common Stock, Cash |  |  |  | 134 |  |  |
Treasury Stock, Value at Dec. 31, 2013 |  |  |  |  | $ (1,598) |  |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  | (651) |  |
Issuance of shares under incentive and stock compensation plans from treasury stock |  |  |  |  | (47) |  |
Return of shares under incentive and stock compensation plans and other to treasury stock | (1) |  |  |  | (13) |  |
Treasury Stock, Value at Jun. 30, 2014 |  |  |  |  | (1,546) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 1,241 |  |  |  |  | 1,241 |
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2013 |  | 453,290 |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Treasury stock acquired |  | (18,968) |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 1,111 |  |  |  |  |
Return of shares under incentive and stock compensation plans and other to treasury stock |  | (378) |  |  |  |  |
Issuance of Shares for Warrant Exercise |  | 15,696 |  |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Jun. 30, 2014 |  | 450,751 |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | 669 |  |
Common Stock, Value, Issued |  | $ 5 |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  | 10,577 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  | 1,162 |
Total stockholders' equity |  |  |  |  |  |  | $ 19,428
Common Stock, Value, Issued | 5 |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | 11,191 |  |  | 11,191 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 928 |  |  |  |  | 928 |
Total stockholders' equity | 18,720 |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 49 |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (153) |  |  |  |
Allocated Share-based Compensation Expense | 36 |  |  |  |  |  |
Additional Paid in Capital at Dec. 31, 2014 | 9,123 |  | 9,123 |  |  |  |
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Tax expense on employee stock options and awards |  |  | $ 26 |  |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 880 |  |  | 880 |  |  |
Dividends, Common Stock, Cash |  |  |  | 150 |  |  |
Treasury Stock, Value at Dec. 31, 2014 | (2,527) |  |  |  | (2,527) |  |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  | (500) |  |
Issuance of shares under incentive and stock compensation plans from treasury stock |  |  |  |  | (161) |  |
Return of shares under incentive and stock compensation plans and other to treasury stock | (18) |  |  |  | (53) |  |
Treasury Stock, Value at Jun. 30, 2015 | (2,870) |  |  |  | (2,870) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ (740) |  |  |  |  | (740) |
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2014 |  | 424,416 |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Treasury stock acquired | (12,100) | (12,117) |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 4,089 |  |  |  |  |
Return of shares under incentive and stock compensation plans and other to treasury stock |  | (1,299) |  |  |  |  |
Issuance of Shares for Warrant Exercise |  | 1,256 |  |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Jun. 30, 2015 |  | 416,345 |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | $ 49 |  |
Common Stock, Value, Issued | $ 5 | $ 5 |  |  |  |  |
Retained Earnings (Accumulated Deficit) | 11,921 |  |  | $ 11,921 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 188 |  |  |  |  | $ 188 |
Total stockholders' equity | $ 18,227 |  |  |  |  |  | $ 18,227

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