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Goodwill - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Goodwill [Line Items]
Goodwill impairment			$ 3,027	[1]	$ 17,100
International Markets [Member]
Goodwill [Line Items]
Goodwill impairment	[1]		$ 2,834
Decrease in estimated difference between fair value and carrying value, percent		16.00%
Terminal Value Percentage Increase Or Decrease Threshold		2.03%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		9.80%
International Markets [Member] | Maximum [Member]
Goodwill [Line Items]
Terminal Value Percentage Increase Or Decrease Threshold		1.53%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		10.30%
Percentage difference between fair value and carrying value in respect of goodwill		11.00%
International Markets [Member] | Minimum [Member]
Goodwill [Line Items]
Terminal Value Percentage Increase Or Decrease Threshold		0.50%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		0.50%
Percentage difference between fair value and carrying value in respect of goodwill		9.00%
Europe [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent		12.00%
Terminal Value Percentage Increase Or Decrease Threshold		1.36%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		9.52%
Europe [Member] | Maximum [Member]
Goodwill [Line Items]
Terminal Value Percentage Increase Or Decrease Threshold		0.86%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		10.02%
Percentage difference between fair value and carrying value in respect of goodwill		8.00%
Europe [Member] | Minimum [Member]
Goodwill [Line Items]
Terminal Value Percentage Increase Or Decrease Threshold		0.50%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		0.50%
Percentage difference between fair value and carrying value in respect of goodwill		6.00%
North America [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent		26.00%
Terminal Value Percentage Increase Or Decrease Threshold		1.61%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		10.22%
North America [Member] | Maximum [Member]
Goodwill [Line Items]
Goodwill impairment		$ 1,230
Terminal Value Percentage Increase Or Decrease Threshold		1.11%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		10.72%
Percentage difference between fair value and carrying value in respect of goodwill		21.00%
North America [Member] | Minimum [Member]
Goodwill [Line Items]
Terminal Value Percentage Increase Or Decrease Threshold		0.50%
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits		0.50%
Percentage difference between fair value and carrying value in respect of goodwill		18.00%
Medis [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent		72.00%
TAPI [Member]
Goodwill [Line Items]
Decrease in estimated difference between fair value and carrying value, percent		23.00%
[1] Goodwill impairment mainly attributable to the International Markets segment, Mexico and Medis.

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