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Summary of Significant Accounting Policies - Transaction and translation losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign currency transaction and translation
Foreign currency transaction losses	$ 14	$ 5	$ 3
Cumulative translation loss adjustments	$ 1,100	$ 1,000

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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