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Other Assets and Investments	12 Months Ended
Other Assets and Investments	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets and Investments	Other Assets and Investments Dividends received from our consolidated subsidiaries were $558 million, $66 million and $46 million in 2017, 2016 and 2015, respectively. Dividends received in 2017 were primarily from a subsidiary in Luxembourg and paid to the United States. Dividends received from our affiliates accounted for using the equity method were $5 million, $4 million and $24 million in 2017, 2016 and 2015, respectively.