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Accounting Policies - Schedule of Changes in Accounting Policy (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts Receivable, net | $ 2,509 | $ 2,028 | $ 2,025
Prepaid Expenses and Other Current Assets | 247 | 231 | 224
Deferred Income Taxes | 2,039 | 2,009 | 2,008
Accounts Payable — Trade | 2,850 | 2,814 | 2,807
Other Current Liabilities | 898 | 1,033 | 1,026
Retained Earnings | 6,084 | 6,041 | 6,044
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts Receivable, net |  |  | 2,025
Prepaid Expenses and Other Current Assets |  |  | 224
Deferred Income Taxes |  |  | 2,008
Accounts Payable — Trade |  |  | 2,807
Other Current Liabilities |  |  | 1,026
Retained Earnings |  |  | $ 6,044
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts Receivable, net | 2,506 |  |
Prepaid Expenses and Other Current Assets | 236 |  |
Deferred Income Taxes | 2,038 |  |
Accounts Payable — Trade | 2,842 |  |
Other Current Liabilities | 887 |  |
Retained Earnings | 6,080 |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts Receivable, net | 3 | 3 |
Prepaid Expenses and Other Current Assets | 11 | 7 |
Deferred Income Taxes | 1 | 1 |
Accounts Payable — Trade | 8 | 7 |
Other Current Liabilities | 11 | 7 |
Retained Earnings | $ (4) | $ (3) |

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