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Information Relating to the Consolidated Statement of Cash Flows - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Share repurchase price		$ 1,751	$ 1	$ 2
Stock repurchased during period (in shares)		14,900,000	0	0
Stock repurchased during period, value		$ 1,750	$ 0	$ 0
Amounts reclassified due to adoption of new accounting standard	[1]	(3,580)	(2,380)	(1,549)
Operating Segments | Upstream
Segment Reporting Information [Line Items]
Non cash transaction in operating segments		$ 1,100
Accounting Standards Update 2016-15
Segment Reporting Information [Line Items]
Amounts reclassified due to adoption of new accounting standard			$ 166	$ 322
[1] 2017 and 2016 adjusted to conform to ASU 2016-15. Refer to Note 3, "Information Relating to the Consolidated Statement of Cash Flows" beginning on page 59.

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