Variable Interest Entities ("VIE's") (CLN Structures' Underlying Collateral By Industry And Rating) (Details)	Dec. 31, 2016
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	100.00%
AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	11.10%
A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	37.40%
BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	32.40%
BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	13.10%
B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Financial Intermediaries [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	12.10%
Financial Intermediaries [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Financial Intermediaries [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
Financial Intermediaries [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	7.10%
Financial Intermediaries [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
Financial Intermediaries [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Financial Intermediaries [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Financial Intermediaries [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Telecommunications [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	7.10%
Telecommunications [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Telecommunications [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Telecommunications [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
Telecommunications [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.10%
Telecommunications [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Telecommunications [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Telecommunications [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Oil And Gas [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	11.10%
Oil And Gas [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Oil And Gas [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
Oil And Gas [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Oil And Gas [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	5.10%
Oil And Gas [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Oil And Gas [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Oil And Gas [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Utilities [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	7.10%
Utilities [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Utilities [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Utilities [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
Utilities [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	4.10%
Utilities [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Utilities [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Utilities [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Chemicals And Plastics [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	5.10%
Chemicals And Plastics [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Chemicals And Plastics [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Chemicals And Plastics [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.10%
Chemicals And Plastics [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Chemicals And Plastics [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Chemicals And Plastics [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Chemicals And Plastics [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Drugs [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
Drugs [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Drugs [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Drugs [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
Drugs [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Drugs [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Drugs [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Drugs [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Retailers (Except Food And Drug) [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	4.00%
Retailers (Except Food And Drug) [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Retailers (Except Food And Drug) [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Retailers (Except Food And Drug) [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
Retailers (Except Food And Drug) [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Retailers (Except Food And Drug) [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Retailers (Except Food And Drug) [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Retailers (Except Food And Drug) [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Industrial Equipment [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	5.10%
Industrial Equipment [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Industrial Equipment [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Industrial Equipment [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.10%
Industrial Equipment [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
Industrial Equipment [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Industrial Equipment [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Industrial Equipment [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Sovereign [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	8.10%
Sovereign [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Sovereign [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.10%
Sovereign [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
Sovereign [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
Sovereign [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Sovereign [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Sovereign [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Conglomerates [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	3.00%
Conglomerates [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Conglomerates [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Conglomerates [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
Conglomerates [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Conglomerates [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Conglomerates [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Conglomerates [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Forest Products [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Forest Products [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Forest Products [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Forest Products [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Forest Products [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Forest Products [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Forest Products [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Forest Products [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Other [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	33.30%
Other [Member] | AAA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	0.00%
Other [Member] | AA [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%
Other [Member] | A [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	9.10%
Other [Member] | BBB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	12.10%
Other [Member] | BB [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	8.10%
Other [Member] | B [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	2.00%
Other [Member] | CCC [Member]
Credit Linked Notes By Industry And Ratings [Line Items]
Credit linked note by industry percentage	1.00%