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Guarantees (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Continued development [Member] | Australia Pacific APLNG [Member]
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	$ 140
Terms of guarantees outstanding	up to 27 years or the life of the venture
Other Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	$ 780
Terms of guarantees outstanding	up to four years
Indemnifications [Member]
Guarantor Obligations [Line Items]
Environmental accruals for known contamination in carrying amount recorded for indemnifications	$ 40
Guarantor Obligations, Current Carrying Value	$ 100
Indemnifications [Member] | Refinery Supplier [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value		$ 98
Carrying value of indemnification asset from other party		$ 98
Guarantee existing sales agreement of natural gas delivery | Australia Pacific APLNG [Member]
Guarantor Obligations [Line Items]
Terms of guarantees outstanding	up to 24 years
Max potential future payments-reckless breach [Member] | Australia Pacific APLNG [Member]
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	$ 1,580
Max potential future payments-prorata share [Member] | Australia Pacific APLNG [Member]
Guarantor Obligations [Line Items]
Maximum potential amount of future payments	$ 940
Finance Reserve Guarantee [Member] | Australia Pacific APLNG [Member]
Guarantor Obligations [Line Items]
Ownership percentage in equity investment	37.50%
Maximum potential amount of future payments	$ 170
Terms of guarantees outstanding	12 years
Carrying value of indemnification asset from other party	$ 14

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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-Name Accounting Standards Codification
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Describe the approximate term of the guarantee or each group of similar guarantees.

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