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Income Taxes - Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Unrecognized Tax Benefits [Line Items]
Balance at the beginning of the year	$ 1,072	$ 1,034	$ 734
Increase (decrease) related to prior year tax positions, net	23	76	56
Increase related to current year tax positions	246	11	26
Decrease related to settlements with tax authorities and lapse of applicable statutes of limitations	(118)	(49)	(56)
Liabilities assumed in acquisitions			273
Other			1
Balance at the end of the year	$ 1,223	$ 1,072	$ 1,034

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Schedule Of Unrecognized Tax Benefits [Line Items]

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Unrecognized Tax Benefits Increase Decrease Resulting From Prior Period Tax Positions

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Unrecognized tax benefits increases decreases other.

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Unrecognized tax benefits of acquirees added in period.

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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
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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

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-Topic 740
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-Section 50
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