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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]
--- | --- | --- | --- | --- | --- | ---
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 |  |  | (164) |  |  |
Allocated Share-based Compensation Expense |  |  | 57 |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 27 |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 87 |  |  |
Net Income (Loss) Attributable to Parent | $ 1,261 |  |  | 1,261 |  |
Dividends, Common Stock, Cash |  |  |  | 237 |  |
Treasury Stock, Value at Dec. 31, 2014 |  |  |  |  | $ (2,527) |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |  |
Treasury stock acquired |  |  |  |  | (800) |
Issuance of shares under incentive and stock compensation plans from treasury stock |  |  |  |  | (182) |
Return of shares under incentive and stock compensation plans and other to treasury stock | (40) |  |  |  | (54) |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | 87 |
Treasury Stock, Value at Sep. 30, 2015 |  |  |  |  | (3,112) |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (788) |  |  |  |  | (788)
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 |  | (18,625.0) |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 4,617.0 |  |  |  |
Return of shares under incentive and stock compensation plans and other to treasury stock |  | (1,306.0) |  |  |  |
Issuance of Shares for Warrant Exercise |  | 2,212.0 |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Sep. 30, 2015 |  | 411,314.0 |  |  |  |
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 |  |  | 8,956 |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  | 12,215 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  | 140
Total stockholders' equity | 18,204 |  |  |  |  |
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 |  |  | 58 |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 2 |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 11 |  |  |
Net Income (Loss) Attributable to Parent | 977 |  |  | 977 |  |
Dividends, Common Stock, Cash |  |  |  | 245 |  |
Treasury stock acquired |  |  |  |  | (1,050) |
Issuance of shares under incentive and stock compensation plans from treasury stock |  |  |  |  | (134) |
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 |  |  |  |  | 11 |
Treasury Stock, Value at Sep. 30, 2016 | (4,509) |  |  |  | $ (4,509) |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 1,316 |  |  |  |  | 1,316
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |
Treasury stock acquired | (24.6) | (24,652.0) |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 3,297.0 |  |  |  |
Return of shares under incentive and stock compensation plans and other to treasury stock |  | (1,091.0) |  |  |  |
Issuance of Shares for Warrant Exercise |  | 273.0 |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Sep. 30, 2016 |  | 379,648.0 |  |  |  |
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 | 8,893 |  | $ 8,893 |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | 13,282 |  |  | $ 13,282 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 987 |  |  |  |  | $ 987
Total stockholders' equity | $ 18,658 |  |  |  |  |

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