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Accounting Policies - Schedule of Changes in Accounting Policy (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred Income Taxes | $ 1,864 | $ 1,854 | $ 1,847
Operating Lease Right-of-Use Assets | 862 | 882 | 0
Property, Plant and Equipment, less Accumulated Depreciation | 7,196 | 7,243 | 7,259
Operating Lease Liabilities due Within One Year | 203 | 204 | 0
Operating Lease Liabilities | 667 | 684 | 0
Long Term Debt and Finance Leases | 5,545 | 5,124 | 5,110
Other Long Term Liabilities | 550 | 465 | 471
Retained Earnings | $ 6,476 | 6,574 | 6,597
Accounting Standards Update 2016-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred Income Taxes |  | 7 |
Operating Lease Right-of-Use Assets |  | 882 |
Property, Plant and Equipment, less Accumulated Depreciation |  | (16) |
Operating Lease Liabilities due Within One Year |  | 204 |
Operating Lease Liabilities |  | 684 |
Long Term Debt and Finance Leases |  | 14 |
Other Long Term Liabilities |  | (6) |
Retained Earnings |  | $ (23) | $ (23)

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