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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance (in shares) |  |  | 1,308 |  |
Balance at December 31, 2017 |  |  | $ 20,501 |  |
Net income (loss) | $ 1,819 | $ 3,069 | 3,358 | $ 5,768 |
Other comprehensive income, net of tax | $ 172 | $ (140) | 130 | $ (158) |
Issuances under employee stock purchase plan |  |  | 48 |  |
Issuances under equity incentive plans |  |  | 109 |  |
Stock-based compensation |  |  | 477 |  |
Repurchases of common stock |  |  | (1,580) |  |
Dividends declared |  |  | $ (1,499) |  |
Cumulative effect from the adoption of new accounting standards |  |  |  |  | $ 190
Ending Balance (in shares) | 1,296 |  | 1,296 |  |
Balance at June 30, 2018 | $ 21,734 |  | $ 21,734 |  |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance (in shares) |  |  | 1,308 |  |
Balance at December 31, 2017 |  |  | $ 1 |  |
Issuances under employee stock purchase plan (in shares) |  |  | 1 |  |
Issuances under equity incentive plans (in shares) |  |  | 8 |  |
Repurchases of common stock (in shares) |  |  | (21) |  |
Ending Balance (in shares) | 1,296 |  | 1,296 |  |
Balance at June 30, 2018 | $ 1 |  | $ 1 |  |
Additional Paid-In Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | 1,264 |  |
Issuances under employee stock purchase plan |  |  | 48 |  |
Issuances under equity incentive plans |  |  | 109 |  |
Stock-based compensation |  |  | 477 |  |
Repurchases of common stock |  |  | (54) |  |
Balance at June 30, 2018 | 1,844 |  | 1,844 |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | 165 |  |
Other comprehensive income, net of tax |  |  | 130 |  |
Cumulative effect from the adoption of new accounting standards |  |  |  |  | (293)
Balance at June 30, 2018 | 2 |  | 2 |  |
Retained Earnings |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | 19,012 |  |
Net income (loss) |  |  | 3,355 |  |
Repurchases of common stock |  |  | (1,526) |  |
Dividends declared |  |  | (1,499) |  |
Cumulative effect from the adoption of new accounting standards |  |  |  |  | $ 483
Balance at June 30, 2018 | 19,825 |  | 19,825 |  |
Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance at December 31, 2017 |  |  | 59 |  |
Net income (loss) |  |  | 3 |  |
Balance at June 30, 2018 | $ 62 |  | $ 62 |  |

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