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Accounting Principles and Practices - (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred tax assets | $ 452 | $ 261 | $ 389
Deferred tax liabilities | 294 | 169 | 127
Other non-current assets | $ 404 | $ 452 | 307
Adoption of new accounting guidance |  |  | 492
Accounting Standards Update 2016-16 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred tax assets |  |  | 23
Deferred tax liabilities |  |  | 12
Other non-current assets |  |  | (26)
Accumulated Other Comprehensive Loss, Net of Tax |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of new accounting guidance |  |  | (1)
Accumulated Other Comprehensive Loss, Net of Tax | Accounting Standards Update 2016-01 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of new accounting guidance |  |  | (1)
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of new accounting guidance |  |  | 493
Retained Earnings | Accounting Standards Update 2016-16 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of new accounting guidance |  |  | (15)
Retained Earnings | Accounting Standards Update 2016-01 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of new accounting guidance |  |  | $ 1

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