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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Number of shares of common stock [Member] | Common stock and additional paid-in capital [Member] | Accumulated deficit [Member] | Accumulated other comprehensive (loss) [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance, Shares at Dec. 31, 2014 |  | 760.4 |  |  |
Beginning Balance at Dec. 31, 2014 | $ 25,778 |  | $ 30,410 | $ (4,624) | $ (8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 6,939 |  |  | 6,939 |
Other comprehensive income (loss), net of tax | (472) |  |  |  | (472)
Dividends | (2,548) |  |  | (2,548) |
Issuance of common stock in connection with the Company’s equity award programs, Shares |  | 5.6 |  |  |
Issuance of common stock in connection with the Company’s equity award programs | 82 |  | 82 |  |
Stock-based compensation expense | 319 |  | 319 |  |
Tax impact related to employee stock-based compensation expense | (162) |  | (162) |  |
Repurchases of common stock, Shares |  | (12.0) |  |  |
Repurchases of common stock | (1,853) |  |  | (1,853) |
Ending Balance, Shares at Dec. 31, 2015 |  | 754.0 |  |  |
Ending Balance at Dec. 31, 2015 | 28,083 |  | 30,649 | (2,086) | (480)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 7,722 |  |  | 7,722 |
Other comprehensive income (loss), net of tax | 9 |  |  |  | 9
Dividends | (3,120) |  |  | (3,120) |
Issuance of common stock in connection with the Company’s equity award programs, Shares |  | 3.9 |  |  |
Issuance of common stock in connection with the Company’s equity award programs | 55 |  | 55 |  |
Stock-based compensation expense | 342 |  | 342 |  |
Tax impact related to employee stock-based compensation expense | (189) |  | (262) | 73 |
Repurchases of common stock, Shares |  | (19.7) |  |  |
Repurchases of common stock | $ (3,027) |  |  | (3,027) |
Ending Balance, Shares at Dec. 31, 2016 | 738.2 | 738.2 |  |  |
Ending Balance at Dec. 31, 2016 | $ 29,875 |  | 30,784 | (438) | (471)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 1,979 |  |  | 1,979 |
Other comprehensive income (loss), net of tax | (208) |  |  |  | (208)
Dividends | (3,487) |  |  | (3,487) |
Issuance of common stock in connection with the Company’s equity award programs, Shares |  | 2.5 |  |  |
Issuance of common stock in connection with the Company’s equity award programs | 52 |  | 52 |  |
Stock-based compensation expense | 347 |  | 347 |  |
Tax impact related to employee stock-based compensation expense | (191) |  | (191) | 0 |
Repurchases of common stock, Shares |  | (18.5) |  |  |
Repurchases of common stock | $ (3,126) |  |  | (3,126) |
Ending Balance, Shares at Dec. 31, 2017 | 722.2 | 722.2 |  |  |
Ending Balance at Dec. 31, 2017 | $ 25,241 |  | $ 30,992 | $ (5,072) | $ (679)

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