v3.8.0.1

Business and Basis of Presentation (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2017 segment division	Dec. 31, 2016 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of Reportable Segments | segment		7
Number of divisions | division		5
Universal Life
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Out of period decrease adjustments	$ (148)		$ (141)
Income From Continuing Operations Before Income Taxes And Equity In Earnings Of Operating Joint Ventures
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Out of period decrease adjustments	$ (153)		$ (134)

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of each individual error being corrected in the correcting adjustment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 1.N)
-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693

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