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Significant Accounting Policies (Schedule of Impact of New Accounting Pronouncements) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
--- | --- | --- | --- | ---
Assets |  |  |  |
Operating lease right-of-use asset | $ 175 | $ 185 | $ 0 |
Other current assets |  | 107 | 108 |
Deferred income taxes |  | 215 | 222 |
Equity in and advances to unconsolidated affiliates | 850 |  | 724 | $ 452
Liabilities |  |  |  |
Operating lease liabilities | 39 | 40 | 0 |
Other current liabilities | 186 | 174 | 179 |
Operating lease liabilities (noncurrent) | 192 | 213 | 0 |
Other liabilities (noncurrent) | 124 | 110 | 202 | 172
Shareholders' equity |  |  |  |
Retained Earnings | $ 1,441 | 1,256 | $ 1,235 | $ 998
Adjustments Due to Topic 842 |  |  |  |
Assets |  |  |  |
Operating lease right-of-use asset |  | 185 |  |
Other current assets |  | (1) |  |
Deferred income taxes |  | 7 |  |
Liabilities |  |  |  |
Operating lease liabilities |  | 40 |  |
Other current liabilities |  | (5) |  |
Operating lease liabilities (noncurrent) |  | 213 |  |
Other liabilities (noncurrent) |  | (92) |  |
Shareholders' equity |  |  |  |
Retained Earnings |  | $ 21 |  |

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