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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	[1]	Sep. 30, 2019	Sep. 30, 2018	[1]
Statement of Comprehensive Income [Abstract]
Reclassification from AOCI to net income, tax				$ 0
Reclassification from AOCI to net income, tax	$ 0	$ (1)			$ 2
Unrealized gains (losses) on foreign currency translation, tax	0	0		0	(1)
Other comprehensive income (loss) related to equity method investee, tax (benefit) expense	0	(2)		0	(2)
Impact of disposal of Canadian Holdings, tax expense	$ 0	$ 0		$ 0	$ 3
[1] Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.

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Disposal Group, Not Discontinued Operation, Tax Effect of Gain (Loss) from Disposal

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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