Securities Available for Sale and Securities Held to Maturity (Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	$ 50,007	$ 34,389
Securities held to maturity, Gross Unrealized Gains	397	542
Securities held to maturity, Gross Unrealized Losses	316	188
Securities held to maturity, Fair Value	50,088	34,743
U.S. agency mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	48,785	33,388
Securities held to maturity, Gross Unrealized Gains	391	531
Securities held to maturity, Gross Unrealized Losses	293	174
Securities held to maturity, Fair Value	48,883	33,745
Non-agency commercial mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	999	1,001
Securities held to maturity, Gross Unrealized Gains	6	11
Securities held to maturity, Gross Unrealized Losses	20	14
Securities held to maturity, Fair Value	985	$ 998
U.S. Treasury securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities held to maturity, Amortized Cost	223
Securities held to maturity, Gross Unrealized Losses	3
Securities held to maturity, Fair Value	$ 220

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.6)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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