Commitments and Contingencies Fiscal Year Maturity Schedule (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Loans and Mortgage-Related Securities [Abstract]
2015	$ 56,333
2016	0
2017	0
2018	0
2019	0
Thereafter	0
Total	56,333us-gaap_PurchaseObligation
Operating Leases [Abstract]
2015	39
2016	32
2017	27
2018	8
2019	0
Thereafter	3
Total	109
Other [Abstract]
2015	209
2016	166us-gaap_OtherCommitmentDueInSecondYear
2017	59us-gaap_OtherCommitmentDueInThirdYear
2018	22us-gaap_OtherCommitmentDueInFourthYear
2019	14us-gaap_OtherCommitmentDueInFifthYear
Thereafter	0
Total	470us-gaap_OtherCommitment
Mortgage commitment derivatives [Member]
Loans and Mortgage-Related Securities [Abstract]
Total	$ 56,200

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697