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Condensed Consolidated Statements of Changes in Stockholders' Equity Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ 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]
--- | --- | --- | --- | --- | --- | --- | ---
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Additional Paid in Capital |  |  | $ 9,123 |  |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  | $ 11,191 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  | $ 928 |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (153) |  |  |  |
Allocated Share-based Compensation Expense |  |  | 36 |  |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 26 |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 49 |  |  |  |
Net Income (Loss) Attributable to Parent | $ 880 |  |  | 880 |  |  |
Dividends, Common Stock, Cash |  |  |  | 150 |  |  |
Treasury Stock, Value at Dec. 31, 2014 |  |  |  |  | $ (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) |  |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | 49 |  |
Treasury Stock, Value at Jun. 30, 2015 |  |  |  |  | (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 |  | 424,416.0 |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Treasury stock acquired |  | (12,117.0) |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 4,089.0 |  |  |  |  |
Return of shares under incentive and stock compensation plans and other to treasury stock |  | (1,299.0) |  |  |  |  |
Issuance of Shares for Warrant Exercise |  | 1,256.0 |  |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Jun. 30, 2015 |  | 416,345.0 |  |  |  |  |
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 0 |  |  |  |
Treasury Stock, Value at Dec. 31, 2014 |  |  |  |  | (2,527) |  |
Treasury Stock, Value at Dec. 31, 2015 | (3,557) |  |  |  | (3,557) |  |
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2014 |  | 424,416.0 |  |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Dec. 31, 2015 |  | 401,821.0 |  |  |  |  |
Preferred Stock, Including Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Common Stock, Value, Issued |  | $ 5 |  |  |  |  |
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Additional Paid in Capital |  |  | 8,983 |  |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  | 11,921 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  | 188 |
Total stockholders' equity |  |  |  |  |  |  | $ 18,227
Common Stock, Value, Issued | 5 |  |  |  |  |  |
Additional Paid in Capital | 8,973 |  | 8,973 |  |  |  |
Retained Earnings (Accumulated Deficit) | 12,550 |  |  | 12,550 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (329) |  |  |  |  | (329) |
Total stockholders' equity | 17,642 |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (129) |  |  |  |
Allocated Share-based Compensation Expense |  |  | 39 |  |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 22 |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 8 |  |  |  |
Net Income (Loss) Attributable to Parent | 539 |  |  | 539 |  |  |
Dividends, Common Stock, Cash |  |  |  | 166 |  |  |
Treasury stock acquired |  |  |  |  | (700) |  |
Issuance of shares under incentive and stock compensation plans from treasury stock |  |  |  |  | (130) |  |
Return of shares under incentive and stock compensation plans and other to treasury stock | (10) |  |  |  | (47) |  |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | 8 |  |
Treasury Stock, Value at Jun. 30, 2016 | (4,166) |  |  |  | $ (4,166) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 1,229 |  |  |  |  | 1,229 |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Treasury stock acquired | (16.2) | (16,222.0) |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 3,203.0 |  |  |  |  |
Return of shares under incentive and stock compensation plans and other to treasury stock |  | (1,078.0) |  |  |  |  |
Issuance of Shares for Warrant Exercise |  | 192.0 |  |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Jun. 30, 2016 |  | 387,916.0 |  |  |  |  |
Preferred Stock, Including Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Common Stock, Value, Issued | $ 5 | $ 5 |  |  |  |  |
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |  |
Additional Paid in Capital | 8,897 |  | $ 8,897 |  |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | 12,923 |  |  | $ 12,923 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 900 |  |  |  |  | $ 900 |
Total stockholders' equity | $ 18,559 |  |  |  |  |  | $ 18,559

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