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U.S. Tax Reform U.S. Tax Reform (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
U.S. Tax Reform Related Matters
U.S. Federal Statutory Income Tax Rate			21.00%	35.00%
U.S. Tax Cuts and Jobs Act
U.S. Tax Reform Related Matters
Other Tax Expense (Benefit)	$ 26	$ 82

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Amount of other income tax expense (benefit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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