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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Effects of Adopting ASC 606 | The impact of adopting the above standards is as follows:
($ in millions) | ASU 2014-09 (Revenue) |  | ASU 2016-01 (Financial Instruments) |  | ASU 2016-16 (Intra-Entity Transfers of Assets Other than Inventory) |  | ASU 2017-12 (Derivatives and Hedging) |  | ASU 2018-02 (Reclassification of Certain Tax Effects) |  | Total
Assets - Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | $ | 5 |  |  |  |  |  |  |  |  |  |  | $ | 5 |
Liabilities - Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Payable |  |  |  |  |  |  | (3 | ) |  |  |  | (3 | )
Debt |  |  |  |  |  |  | 14 |  |  |  |  | 14 |
Deferred Income Taxes |  |  |  |  | (54 | ) |  |  |  |  |  | (54 | )
Equity - Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 5 |  |  | 8 |  |  | 54 |  |  | (11 | ) |  | 266 |  |  | 322 |
Accumulated other comprehensive loss |  |  | (8 | ) |  |  |  |  |  | (266 | ) |  | (274 | )
The following table provides the effects of adopting ASC 606 on the Consolidated Statement of Income for the three and six months ended June 30, 2018:
| Three Months Ended June 30, 2018 |  | Six Months Ended June 30, 2018
($ in millions) | As Reported |  | Effects of Adopting ASC 606 |  | Amounts Without Adoption of ASC 606 |  | As Reported |  | Effects of Adopting ASC 606 |  | Amounts Without Adoption of ASC 606
Sales | $ | 10,465 |  |  | $ | (6 | ) |  | $ | 10,459 |  |  | $ | 20,502 |  |  | $ | (29 | ) |  | $ | 20,473 |
Materials and production | 3,417 |  |  | (5 | ) |  | 3,412 |  |  | 6,601 |  |  | (16 | ) |  | 6,585 |
Income before taxes | 2,086 |  |  | (1 | ) |  | 2,085 |  |  | 3,432 |  |  | (13 | ) |  | 3,419 |
Taxes on income | 370 |  |  | (1 | ) |  | 369 |  |  | 975 |  |  | (3 | ) |  | 972 |
Net income attributable to Merck & Co., Inc. | 1,707 |  |  | — |  |  | 1,707 |  |  | 2,443 |  |  | (10 | ) |  | 2,433 |
The following table provides the effects of adopting ASC 606 on the Consolidated Balance Sheet as of June 30, 2018:
| June 30, 2018
($ in millions) | As Reported |  | Effects of Adopting ASC 606 |  | Amounts Without Adoption of ASC 606
Assets |  |  |  |  |
Accounts receivable | $ | 7,287 |  |  | $ | (47 | ) |  | $ | 7,240 |
Inventories | 5,178 |  |  | 18 |  |  | 5,196 |
Liabilities |  |  |  |  |  |
Accrued and other current liabilities | 9,755 |  |  | (9 | ) |  | 9,746 |
Income taxes payable | 661 |  |  | (5 | ) |  | 656 |
Equity |  |  |  |  |  |
Retained earnings | 41,523 |  |  | (15 | ) |  | 41,508 |

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