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Goodwill - Additional Information (Detail) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Goodwill [Line Items]
Number of operating segments | Segment				3
Goodwill impairment	$ 120		$ 6,100	$ 300	$ 6,100
Remaining goodwill allocated to reporting unit	$ 27,648			$ 27,648		$ 28,414
Possible increase in risk free interest rate	0.50%			0.50%
Europe [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	6.00%
Risk of change in fair value due to change in risk free interest rate				$ 911
Risk of impairment loss due to change in risk free interest rate				65
International Markets [Member]
Goodwill [Line Items]
Goodwill impairment	$ 0
Risk of change in fair value due to change in risk free interest rate				642
Risk of impairment loss due to change in risk free interest rate				$ 443
North America [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	35.00%
Other Segments [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	47.00%
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] | International Markets [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	6.00%
Minimum [Member] | International Markets [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	2.00%

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