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Operating Segments - Geographic Data (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Geographic Data
Total revenues	$ 5,952	$ 5,170	$ 4,950	$ 4,111	$ 4,996	$ 5,551	$ 6,663	$ 5,942	$ 20,182	$ 23,152	$ 43,464
Long-lived assets	19,936				19,310				19,936	19,310
United States
Geographic Data
Total revenues									15,599	18,701	34,860
Long-lived assets	16,041				15,942				16,041	15,942
Canada
Geographic Data
Total revenues									4,583	4,451	$ 8,604
Long-lived assets	$ 3,895				$ 3,368				$ 3,895	$ 3,368

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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No definition available.

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