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Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact on Investments in unconsolidated entities	$ 2,539		$ 2,756
ASU 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact on Investments in unconsolidated entities		$ 113
Impact on retained earnings		$ 113

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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-Topic 210
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- Definition

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