Note 2. Lease Accounting Policy Supplemental Balance Sheet Information Related to Leases (Details) $ in Millions	Mar. 31, 2019 USD ($)
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating Lease, Right-of-Use Asset	$ 661
Operating Lease, Weighted Average Remaining Lease Term	11 years 8 months 4 days
Finance Lease, Weighted Average Remaining Lease Term	11 years 7 months 2 days
Operating Lease, Liability	$ 721
UNITED STATES
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating Lease, Right-of-Use Asset	281
Operating Lease, Liability	$ 330

Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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-Name Accounting Standards Codification
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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (g)(3)
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[Line Items] for Supplemental Balance Sheet Information Related to Leases [Table]

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