Employee Benefit Plans (Changes in Fair Value of Level 3 Pension and Post Retirement Assets) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Pooled Separate Accounts \| Fixed Maturities \| Pension Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	$ 36	$ 35
Actual Return on Assets:
Relating to assets still held at the reporting date	2	1
Relating to assets sold during the period	0	0
Purchases, sales and settlements	0	0
Transfers in and/or out of Level 3	0	0
Fair Value, end of period	38	36
Pooled Separate Accounts \| Real Estate \| Pension Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	666	607
Actual Return on Assets:
Relating to assets still held at the reporting date	50	61
Relating to assets sold during the period	6	6
Purchases, sales and settlements	(8)	(8)
Transfers in and/or out of Level 3	0	0
Fair Value, end of period	714	666
Corporate Debt \| Fixed Maturities \| Pension Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0
Actual Return on Assets:
Relating to assets still held at the reporting date	0
Relating to assets sold during the period	0
Purchases, sales and settlements	0
Transfers in and/or out of Level 3	1
Fair Value, end of period	1	0
Corporate Debt \| Asset-backed \| Fixed Maturities \| Other Postretirement Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	1	0
Actual Return on Assets:
Relating to assets still held at the reporting date	0	0
Relating to assets sold during the period	0	0
Purchases, sales and settlements	0	1
Transfers in and/or out of Level 3	(1)	0
Fair Value, end of period	0	1
Collateralized Mortgage Obligations \| Corporate Debt \| Fixed Maturities \| Other Postretirement Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	5	0
Actual Return on Assets:
Relating to assets still held at the reporting date	0	0
Relating to assets sold during the period	0	0
Purchases, sales and settlements	(3)	5
Transfers in and/or out of Level 3	0	0
Fair Value, end of period	2	5
Collateralized loan obligations \| Corporate Debt \| Fixed Maturities \| Other Postretirement Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0
Actual Return on Assets:
Relating to assets still held at the reporting date	0
Relating to assets sold during the period	0
Purchases, sales and settlements	2
Transfers in and/or out of Level 3	0
Fair Value, end of period	2	0
Other \| Fixed Maturities \| Pension Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	49	93
Actual Return on Assets:
Relating to assets still held at the reporting date	0	0
Relating to assets sold during the period	0	0
Purchases, sales and settlements	(10)	(44)
Transfers in and/or out of Level 3	0	0
Fair Value, end of period	39	49
Other \| Fixed Maturities \| Other Postretirement Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	5	3
Actual Return on Assets:
Relating to assets still held at the reporting date	0	0
Relating to assets sold during the period	0	0
Purchases, sales and settlements	0	2
Transfers in and/or out of Level 3	0	0
Fair Value, end of period	$ 5	$ 5

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(02)(A)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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