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Subsequent Events (Unaudited) (Details) - USD ($) shares in Millions				1 Months Ended		3 Months Ended		5 Months Ended	6 Months Ended		12 Months Ended
	Aug. 04, 2016	Jul. 29, 2016	Jan. 05, 2016	Aug. 04, 2016	Jul. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jan. 05, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Proceeds from Issuance of Common Stock			$ 1,970,000,000						$ 32,000,000	$ 0
Stock Issued During Period, Shares, New Issues			4				17				210	206
Fees and Commissions			$ 20,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from Issuance of Common Stock, Gross					$ 226,000,000
Subsequent Event, Date						Jul. 27, 2016
Stock Issued During Period, Shares, New Issues				8	3
Common Stock, Value of Shares Authorized for Issue in Transaction		$ 12,000,000
Common Stock [Member]
Subsequent Event [Line Items]
Proceeds from Issuance of Common Stock, Gross			$ 32,000,000									$ 2,000,000,000
Stock Issued During Period, Shares, New Issues									70
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from Issuance of Common Stock, Gross	$ 167,000,000			$ 85,000,000
Proceeds from Issuance of Common Stock	166,000,000
Common Stock, Value of Shares Authorized for Issue in Transaction	12.69
Fees and Commissions	$ 1,000,000
Common Stock [Member] | Maximum [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from Issuance of Common Stock, Gross								$ 1,500,000,000
Stock Issued During Period, Shares, New Issues	13

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The value of shares authorized for issue in an equity transaction.

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The gross cash inflow from the additional capital contribution to the entity, before commissions and fees.

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- Definition

Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Name Accounting Standards Codification
-Topic 505
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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