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Condensed consolidated statements of cash flows - additional details - Depreciation, amortization, impairments and fair value adjustments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation, amortization, impairments and fair value adjustments	$ 709	$ 615
Property, plant and equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation, amortization, impairments and fair value adjustments	129	119
Right-of-use assets [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation, amortization, impairments and fair value adjustments	29	0
Intangible assets other than goodwill [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation, amortization, impairments and fair value adjustments	536	555
Financial asset [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation, amortization, impairments and fair value adjustments	$ 15	$ (59)

X

- Definition

Adjustments For Depreciation, Amortisation, Impairment Loss (Reversal Of Impairment Loss) Recognised In Profit Or Loss, And Fair Value Losses (Gains)

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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