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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 |  |  | $ 8,973 |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  | $ 12,550 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (329) |  |  |  |  | $ (329)
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, Value at Dec. 31, 2015 |  |  |  |  | $ (3,557) |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |  |
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 |  |  |  |  | (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) |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 1,229 |  |  |  |  | 1,229
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2015 |  | 401,821.0 |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |
Treasury stock acquired |  | (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 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 254 |  |  |  |  |
Net Income (Loss) Attributable to Parent | 216 |  |  |  |  |
Treasury Stock, Value at Jun. 30, 2016 |  |  |  |  | (4,166) |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 646 |  |  |  |  |
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 |  |  |  |
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |
Additional Paid in Capital |  |  | 8,897 |  |  |
Retained Earnings (Accumulated Deficit) [Abstract] |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  | 12,923 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  | 900
Stockholders' Equity Attributable to Parent | 18,559 |  |  |  |  |
Common Stock, Value, Issued | 4 |  |  |  |  |
Additional Paid in Capital | 5,247 |  | 5,247 |  |  |
Retained Earnings (Accumulated Deficit) | 13,114 |  |  | 13,114 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (337) |  |  |  |  | (337)
Stockholders' Equity Attributable to Parent | 16,903 |  |  |  |  |
Treasury Stock, Value at Dec. 31, 2016 | $ (1,125) |  |  |  | (1,125) |
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2016 |  | 373,949.0 |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |
Treasury stock acquired | (6.7) |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |  |  | (65) |  |  |
Allocated Share-based Compensation Expense |  |  | 56 |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 0 |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  | 43 |  |  |
Net Income (Loss) Attributable to Parent | $ 338 |  |  | 338 |  |
Dividends, Common Stock, Cash |  |  |  | 170 |  |
Treasury Stock, Value at Dec. 31, 2016 | (1,125) |  |  |  | (1,125) |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |  |
Treasury stock acquired |  |  |  |  | (650) |
Issuance of shares under incentive and stock compensation plans from treasury stock |  |  |  |  | (79) |
Return of shares under incentive and stock compensation plans and other to treasury stock |  |  |  |  | (34) |
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs |  |  |  |  | 43 |
Treasury Stock, Value at Jun. 30, 2017 | (1,687) |  |  |  | (1,687) |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 831 |  |  |  |  | 831
Common Shares Outstanding, at beginning of period (in thousands) at Dec. 31, 2016 |  | 373,949.0 |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |
Treasury stock acquired | (13.3) | (13,299.0) |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 1,850.0 |  |  |  |
Return of shares under incentive and stock compensation plans and other to treasury stock |  | (686.0) |  |  |  |
Issuance of Shares for Warrant Exercise |  | 1,006.0 |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Jun. 30, 2017 |  | 362,820.0 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (207) |  |  |  |  |
Net Income (Loss) Attributable to Parent | (40) |  |  |  |  |
Treasury Stock, Value at Jun. 30, 2017 | (1,687) |  |  |  | $ (1,687) |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 701 |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |
Treasury stock acquired | (6.6) |  |  |  |  |
Common Shares Outstanding, at end of period (in thousands) at Jun. 30, 2017 |  | 362,820.0 |  |  |  |
Preferred Stock, Including Additional Paid in Capital [Abstract] |  |  |  |  |  |
Common Stock, Value, Issued | $ 4 | $ 4 |  |  |  |
Adjustments to Additional Paid in Capital [Abstract] |  |  |  |  |  |
Additional Paid in Capital | 5,195 |  | $ 5,195 |  |  |
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 | 494 |  |  |  |  | $ 494
Stockholders' Equity Attributable to Parent | $ 17,288 |  |  |  |  |

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