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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract] |
Schedule of Stock Repurchases | The following table summarizes our stock repurchases under the above-described programs (in millions, except per share data):
|  | Year ended December 31,
|  | 2017 (1) |  | 2016 (2) |  | 2015 (3)
Shares repurchased and retired |  | 13 |  |  | 123 |  |  | 95 |
Amount |  | $ | 954 |  |  | $ | 11,001 |  |  | $ | 10,002 |
Average price per share |  | $ | 71.79 |  |  | $ | 89.15 |  |  | $ | 104.91 |
_______________________ |  |  |  |  |  |
Notes:
(1) | All repurchases were under the 2016 Program.
(2) | Includes 36 million shares repurchased for $3.0 billion under the 2016 Program and 87 million shares repurchased for $8.0 billion under the 2015 Program.
(3) | Includes 65 million shares repurchased for $7.0 billion under the 2015 Program and 30 million shares repurchased for $3.0 billion under the 2014 Program.
Reduction to common stock and APIC as a result of stock repurchases | The following table summarizes the reduction of common stock and APIC and the charge to retained earnings as a result of our stock repurchases (in millions):
|  | Year ended December 31,
|  | 2017 |  | 2016 |  | 2015
Reduction of common stock and APIC |  | $ | 34 |  |  | $ | 302 |  |  | $ | 223 |
Charge to retained earnings |  | $ | 1,028 |  |  | $ | 10,883 |  |  | $ | 10,115 |
Schedule of Dividends Declared | The following table summarizes cash dividends declared on our common stock (in millions, except per share data):
|  | 2017 |  | 2016
|  | Dividend Per Share |  | Amount |  | Dividend Per Share |  | Amount
First quarter |  | $ | 0.52 |  |  | $ | 685 |  |  | $ | 0.43 |  |  | $ | 587 |
Second quarter |  | 0.52 |  |  | 685 |  |  | 0.47 |  |  | 631 |
Third quarter |  | 0.52 |  |  | 685 |  |  | 0.47 |  |  | 625 |
Fourth quarter |  | 0.52 |  |  | 687 |  |  | 0.47 |  |  | 622 |
Total |  | $ | 2.08 |  |  | $ | 2,742 |  |  | $ | 1.84 |  |  | $ | 2,465 |
Schedule of accumulated OCI by component | The following table summarizes the changes in AOCI by component, net of tax (in millions):
|  | Foreign Currency Translation |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Unrealized Gains and Losses on Cash Flow Hedges |  | Total
Balance at December 31, 2015 |  | $ | (45 | ) |  | $ | (16 | ) |  | $ | 149 |  |  | $ | 88 |
Other comprehensive income before reclassifications |  | 177 |  |  | 7 |  |  | 5 |  |  | 189 |
Amounts reclassified from accumulated other comprehensive income |  | — |  |  | (7 | ) |  | 8 |  |  | 1 |
Net current period other comprehensive income |  | 177 |  |  | — |  |  | 13 |  |  | 190 |
Balance at December 31, 2016 |  | 132 |  |  | (16 | ) |  | 162 |  |  | 278 |
Other comprehensive income (loss) before reclassifications |  | (47 | ) |  | 218 |  |  | (304 | ) |  | (133 | )
Amounts reclassified from accumulated other comprehensive income |  | — |  |  | (8 | ) |  | 28 |  |  | 20 |
Net current period other comprehensive income (loss) |  | (47 | ) |  | 210 |  |  | (276 | ) |  | (113 | )
Balance at December 31, 2017 |  | $ | 85 |  |  | $ | 194 |  |  | $ | (114 | ) |  | $ | 165 |

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