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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Stock-Based Compensation on Tender Offer [Member] | Common Stock [Member] | Additional Paid in Capital [Member] | Additional Paid in Capital [Member] Stock-Based Compensation on Tender Offer [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings (Loss) [Member] | Total Company Stockholders' Equity [Member] | Total Company Stockholders' Equity [Member] Stock-Based Compensation on Tender Offer [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 20,772 |  | $ 4 | $ 8,341 |  | $ (834) | $ 13,181 | $ 20,692 |  | $ 80
Beginning Balance, shares at Dec. 31, 2014 |  |  | 419 |  |  |  |  |  |  |
Net income (loss) | (767) |  |  |  |  |  | (769) | (769) |  | 2
Other comprehensive income (loss), net | (719) |  |  |  |  | (719) |  | (719) |  |
Cash dividends, per common share | (710) |  |  |  |  |  | (710) | (710) |  |
Noncontrolling interest | (5) |  |  |  |  |  |  |  |  | (5)
Stock-based compensation | 109 |  |  | 109 |  |  |  | 109 |  |
Common stock issued | 7 |  |  | 7 |  |  |  | 7 |  |
Common stock issued, shares |  |  | 1 |  |  |  |  |  |  |
Withholding taxes | (5) |  |  | (5) |  |  |  | (5) |  |
Share repurchases, value | (2,221) |  |  | (446) |  |  | (1,775) | (2,221) |  |
Share repurchases, shares |  |  | (44) |  |  |  |  |  |  |
Excess tax benefit from stock-based compensation | (1) |  |  | (1) |  |  |  | (1) |  |
Ending Balance at Dec. 31, 2015 | 16,460 |  | $ 4 | 8,005 |  | (1,553) | 9,927 | 16,383 |  | 77
Ending Balance, shares at Dec. 31, 2015 |  |  | 376 |  |  |  |  |  |  |
Net income (loss) | (2,416) |  |  |  |  |  | (2,412) | (2,412) |  | (4)
Other comprehensive income (loss), net | 101 |  |  |  |  | 101 |  | 101 |  |
Cash dividends, per common share | (230) |  |  |  |  |  | (230) | (230) |  |
Noncontrolling interest | (10) |  |  |  |  |  |  |  |  | (10)
Stock-based compensation | 87 |  |  | 87 |  |  |  | 87 |  |
Common stock issued | 4 |  |  | 4 |  |  |  | 4 |  |
Common stock issued, shares |  |  | 2 |  |  |  |  |  |  |
Stock issued in acquisition | 18 |  |  | 18 |  |  |  | 18 |  |
Stock issued in acquisition, shares |  |  | 1 |  |  |  |  |  |  |
Withholding taxes | (4) |  |  | (4) |  |  |  | (4) |  |
Excess tax benefit from stock-based compensation | (7) |  |  | (7) |  |  |  | (7) |  |
Ending Balance at Dec. 31, 2016 | 14,003 |  | $ 4 | 8,103 |  | (1,452) | 7,285 | 13,940 |  | 63
Ending Balance, shares at Dec. 31, 2016 |  |  | 379 |  |  |  |  |  |  |
Net income (loss) | (236) |  |  |  |  |  | (237) | (237) |  | 1
Other comprehensive income (loss), net | 342 |  |  |  |  | 342 |  | 342 |  |
Cash dividends, per common share | (76) |  |  |  |  |  | (76) | (76) |  |
Adoption of new accounting standards | (5) |  |  | 1 |  |  | (6) | (5) |  |
Noncontrolling interest | 2 |  |  |  |  |  |  |  |  | 2
Stock-based compensation | 105 | $ 20 |  | 105 | $ 20 |  |  | 105 | $ 20 |
Common stock issued | 13 |  |  | 13 |  |  |  | 13 |  |
Common stock issued, shares |  |  | 1 |  |  |  |  |  |  |
Withholding taxes | (8) |  |  | (8) |  |  |  | (8) |  |
Ending Balance at Dec. 31, 2017 | $ 14,160 |  | $ 4 | $ 8,234 |  | $ (1,110) | $ 6,966 | $ 14,094 |  | $ 66
Ending Balance, shares at Dec. 31, 2017 |  |  | 380 |  |  |  |  |  |  |

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