Outstanding Exposure - Puerto Rico Net Par Outstanding, Amortization Schedule of BIG Net Par Outstanding and BIG Net Par Outstanding and BIG Net Debt Service Outstanding of Puerto Rico (Details) (USD $) In Millions, unless otherwise specified																																										0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Below investment grade (BIG)	Dec. 31, 2013 Below investment grade (BIG)	Sep. 30, 2014 Puerto Rico	Sep. 30, 2014 Puerto Rico BB-	Dec. 31, 2013 Puerto Rico BB	Sep. 30, 2014 Puerto Rico Below investment grade (BIG)	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico	Dec. 31, 2013 Subject to the Terms of the Recovery Act Puerto Rico	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico Puerto Rico Public Finance Corporation	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Highways and Transportation Authority	Dec. 31, 2013 Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Highways and Transportation Authority	Dec. 31, 2013 Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Electric Power Authority (PREPA)	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Aqueduct and Sewer Authority	Dec. 31, 2013 Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Aqueduct and Sewer Authority	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Convention Center District Authority	Dec. 31, 2013 Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Convention Center District Authority	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico B- Puerto Rico Electric Power Authority (PREPA)	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico BB Puerto Rico Highways and Transportation Authority	Dec. 31, 2013 Subject to the Terms of the Recovery Act Puerto Rico BB Puerto Rico Highways and Transportation Authority	Dec. 31, 2013 Subject to the Terms of the Recovery Act Puerto Rico B Puerto Rico Public Finance Corporation	Sep. 30, 2014 Subject to the Terms of the Recovery Act Puerto Rico Below investment grade (BIG)	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Municipal Finance Authority	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Municipal Finance Authority	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Infrastructure Financing Authority	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico BB- Puerto Rico Infrastructure Financing Authority	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BB- University of Puerto Rico	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico BB- University of Puerto Rico	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BB	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico BB	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BB Commonwealth of Puerto Rico - General Obligation Bonds	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico BB Commonwealth of Puerto Rico - General Obligation Bonds	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BB Puerto Rico Public Buildings Authority	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico BB Puerto Rico Public Buildings Authority	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BB GDB	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico BB GDB	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico BBB Puerto Rico Sales Tax Financing Corporation	Dec. 31, 2013 Not Subject to the Terms of the Recovery Act Puerto Rico A- Puerto Rico Sales Tax Financing Corporation	Sep. 30, 2014 Not Subject to the Terms of the Recovery Act Puerto Rico Below investment grade (BIG)	Jul. 17, 2014 Puerto Rico	Aug. 14, 2014 Puerto Rico	Sep. 30, 2014 Sovereign debt Puerto Rico
Guarantor Obligations [Line Items]
Puerto Rico Electric Power Authority, deposit in reserve account utilized to pay debt service due on bonds																																										$ 42
Gross par outstanding					6,035				3,058															2,977
Gross debt service outstanding	672,048	737,380			10,077				5,328															4,749
Net par amount outstanding including loss mitigation bonds	419,304	460,302				4,940	5,441		2,447	2,647	0	844	872	860	384	384	174	185	772	273	302	44			400	450	18	18	1	1	2,493	2,794	1,672	1,885	101	139	33	33	268	268				4,900
Percentage of outstanding bonds of PREPA																																											60.00%
Estimated Net Par Amortization [Abstract]
2014 (October 1-December 31)								0															0																		0
2015								331															126																		205
2016								267															84																		183
2017								207															41																		166
2018								157															48																		109
2019								187															61																		126
2020								255															73																		182
2021								109															51																		58
2022								109															42																		67
2023								142															102																		40
2024-2028								932															581																		351
2029-2033								695															375																		320
2034-2038								865															460																		405
2039-2043								170															157																		13
2044-2047								246															246																		0
Total	418,015	459,107	19,646	22,538	4,900			4,672															2,447																		2,225
Insured Financial Obligations, Maturities of Outstanding Contractual Payments [Abstract]
2014 (October 1- December 31)								3															2																		1
2015								567															249																		318
2016								486															199																		287
2017								415															153																		262
2018								353															158																		195
2019								375															168																		207
2020								434															176																		258
2021								275															151																		124
2022								269															140																		129
2023								297															198																		99
2024-2028								1,580															983																		597
2029-2033								1,140															650																		490
2034-2038								1,072															613																		459
2039-2043								249															234																		15
2044-2047								284															284																		0
Total	$ 631,453	$ 690,535						$ 7,799															$ 4,358																		$ 3,441