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Goodwill - Additional Information (Detail) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($) Segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Goodwill [Line Items]
Number of operating segments | Segment					3
Goodwill impairment					$ 300	$ 6,100
Remaining goodwill allocated to reporting unit	$ 27,585				$ 27,585		$ 28,414
Possible increase in risk free interest rate	0.50%				0.50%
Europe [Member]
Goodwill [Line Items]
Goodwill impairment	$ 0
Risk of change in fair value due to change in risk free interest rate					$ 871
Risk of impairment loss due to change in risk free interest rate					243
International Markets [Member]
Goodwill [Line Items]
Goodwill impairment	$ 0			$ 0
Risk of change in fair value due to change in risk free interest rate					653
Risk of impairment loss due to change in risk free interest rate					$ 605
North America [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	36.00%				36.00%
Other Segments [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	43.00%				43.00%
Rimsa [Member]
Goodwill [Line Items]
Goodwill impairment			$ 180
Remaining goodwill allocated to reporting unit			$ 706
Mexico [Member]
Goodwill [Line Items]
Goodwill impairment		$ 120
Maximum [Member] | Europe [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	6.00%				6.00%
Maximum [Member] | International Markets [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	2.00%	6.00%		6.00%	2.00%
Minimum [Member] | Europe [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	4.00%				4.00%
Minimum [Member] | International Markets [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	1.00%	2.00%		2.00%	1.00%

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