Leases Components of balance sheet (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Impairment of right-of-use assets associated with operating leases	$ 191
Operating lease right-of-use assets (non-current)		$ 913	$ 934
Current portion of operating lease liabliities		224	240
Operating lease liabilities (non-current)		791	845
Other assets
Finance leases - Other assets (non-current)		124	85
Other current liabilities
Finance leases - Other current liabilities		26	26
Other liabilities
Finance leases - Other liabilities (non-current)		$ 115	$ 85

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
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-Subparagraph (a)
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