Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance, Foreign Currency Translation Adjustments		$ (661)		$ (382)	$ (661)	$ (382)
Beginning Balance, Translation Adjustments on Net Investment Hedge		(66)		(141)	(66)	(141)
Beginning Balance, Defined Benefit Pension and Other Postretirement Plans		10		25	10	25
Beginning Balance, Investment Securities Available-for-Sale		(1)		1	(1)	1
Beginning Balance, Accumulated Other Comprehensive Income (Loss)		(718)		(497)	(718)	(497)
Current period other comprehensive income (loss), Foreign Currency Translation Adjustments	$ (34)		$ (345)		(20)	(186)
Current period other comprehensive income (loss), Translation Adjustments on Net Investment Hedge	(22)		86		6	53
Current period other comprehensive income (loss), Defined Benefit Pension and Other Postretirement Plans	(1)		0		(1)	(1)
Current period other comprehensive income (loss), Investment Securities Available-for-Sale	0		0		3	(1)
Current period other comprehensive income (loss)	(57)	$ 45	(259)	$ 124	(12)	(135)
Ending Balance, Foreign Currency Translation Adjustments	(681)		(568)		(681)	(568)
Ending Balance, Translation Adjustments on Net Investment Hedge	(60)		(88)		(60)	(88)
Ending Balance, Defined Benefit Pension and Other Postretirement Plans	9		24		9	24
Ending Balance, Investment Securities Available-for-Sale	2		0		2	0
Ending Balance, Accumulated Other Comprehensive Income (Loss)	$ (730)		$ (632)		$ (730)	$ (632)

Amount after tax, after translation adjustments on Accumulated Comprehensive Income Loss on Net Investment Hedge.

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Amount after tax, after translation adjustments on Other Comprehensive Income Loss on Net Investment Hedge.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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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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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and 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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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount, after tax, before reclassification adjustment, of (increase) decrease in accumulated other comprehensive income of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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