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Income Taxes - Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Unrecognized Tax Benefits [Line Items] |  |  |
Balance at the beginning of the year | $ 1,034 | $ 734 | $ 648
Increase (decrease) related to prior year tax positions, net | 76 | 56 | 23
Increase related to current year tax positions | 11 | 26 | 71
Decrease related to settlements with tax authorities and lapse of applicable statutes of limitations | (49) | (56) | (103)
Liabilities assumed in acquisitions |  | 273 | 101
Other |  | 1 | (6)
Balance at the end of the year | $ 1,072 | $ 1,034 | $ 734

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- Definition Unrecognized tax benefits of acquirees added in period. + References No definition available. + Details
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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 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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