Income Taxes - Change in Unrecognized Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
January 1	$ 516	$ 579	$ 610
Increases from positions taken during prior periods	27	36	33
Decreases from positions taken during prior periods	(35)	(43)	(93)
Increases from positions taken during the current period	50	57	64
Decreases relating to settlements with taxing authorities	(64)	(45)	(54)
Reductions resulting from the lapse of the applicable statute of limitations	(64)	(31)	(29)
Currency/other	(4)	(37)	48
December 31	$ 426	$ 516	$ 579

Unrecognized Tax Benefits Decrease Currency Other

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- Definition

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

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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