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Accounting Principles and Practices (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Deferred tax assets | $ 296 | $ 261 | $ 389 |
Deferred tax liabilities | 243 | 169 | 127 |
Other non-current assets | $ 439 | $ 452 | 307 |
Adoption of new accounting guidance |  |  | 492 | $ 49
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 | $ 49
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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