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Goodwill - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018
Goodwill [Line Items]
Goodwill impairment				$ 11,000	$ 6,100	$ 3,027	$ 17,100	$ 900
Goodwill	$ 24,917			28,414		24,917	28,414	$ 44,409
MEXICO
Goodwill [Line Items]
Goodwill impairment		$ 120
International Markets [Member]
Goodwill [Line Items]
Goodwill impairment	2,530	$ 0				2,834
Goodwill	2,479			5,404		2,479	5,404
International Markets [Member] | Reduction in the terminal value growth rate of 0.1% [Member]
Goodwill [Line Items]
Goodwill impairment	48
International Markets [Member] | Increase in discount rate of 0.1% [Member]
Goodwill [Line Items]
Goodwill impairment	68
International Markets [Member] | Maximum [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent		6.00%							2.00%
International Markets [Member] | Minimum [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent		2.00%							1.00%
Europe [Member]
Goodwill [Line Items]
Goodwill	8,653			9,001		8,653	9,001
Decrease in estimated difference between fair value and carrying value, percent									6.00%
Europe [Member] | Reduction in the terminal value growth rate of 0.1% [Member]
Goodwill [Line Items]
Goodwill impairment	121
Europe [Member] | Increase in discount rate of 0.1% [Member]
Goodwill [Line Items]
Goodwill impairment	171
Europe [Member] | Maximum [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent									6.00%
Europe [Member] | Minimum [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent									4.00%
North America [Member]
Goodwill [Line Items]
Goodwill	$ 11,098			$ 11,144		$ 11,098	$ 11,144
Decrease in estimated difference between fair value and carrying value, percent	28.00%					28.00%
Rimsa [Member]
Goodwill [Line Items]
Goodwill impairment			$ 180
Goodwill			$ 706
Medis [Member]
Goodwill [Line Items]
Goodwill impairment	$ 170
Goodwill	$ 300					$ 300
TAPI [Member] | North America [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent	47.00%					47.00%

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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