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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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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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