Leases - Maturity of lease liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
Operating leases
2019	$ 39
2020	61
2021	37
2022	28
2023	18
2024 and thereafter	32
Total lease payments	215
Less: imputed interest	(19)
Total operating lease liabilities	196	$ 214
Finance leases
2019	5
2020	8
2021	8
2022	6
2023	6
2024 and thereafter	17
Total lease payments	50
Less: imputed interest	(9)
Total finance lease liabilities	41
Minimum payments related to leases not yet commenced	$ 85

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in remainder of fiscal year following latest fiscal year ended.

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-Publisher FASB
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-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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