Investment Securities (Securities with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss, Held to Maturity) (Details) $ in Millions	Dec. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity securities: Less than 12 months Fair Value	$ 52,185	$ 25,168
Held to maturity securities: Less than 12 months Unrealized Losses	1,095	276
Held to maturity securities: 12 months or longer Fair Value		1,842
Held to maturity securities: 12 months or longer Unrealized Losses		40
Held to maturity securities: Total Fair Value	52,185	27,010
Held to maturity securities: Total Unrealized Losses	$ 1,095	$ 316
Number of held to maturity securities in unrealized loss positions \| security	612	286
U.S. agency mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity securities: Less than 12 months Fair Value	$ 51,361	$ 24,219
Held to maturity securities: Less than 12 months Unrealized Losses	1,086	253
Held to maturity securities: 12 months or longer Fair Value		1,842
Held to maturity securities: 12 months or longer Unrealized Losses		40
Held to maturity securities: Total Fair Value	51,361	26,061
Held to maturity securities: Total Unrealized Losses	1,086	293
Non-agency commercial mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity securities: Less than 12 months Fair Value	591	729
Held to maturity securities: Less than 12 months Unrealized Losses	4	20
Held to maturity securities: 12 months or longer Fair Value
Held to maturity securities: 12 months or longer Unrealized Losses
Held to maturity securities: Total Fair Value	591	729
Held to maturity securities: Total Unrealized Losses	4	20
U.S. Treasury securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity securities: Less than 12 months Fair Value	219	220
Held to maturity securities: Less than 12 months Unrealized Losses	4	3
Held to maturity securities: 12 months or longer Fair Value
Held to maturity securities: 12 months or longer Unrealized Losses
Held to maturity securities: Total Fair Value	219	220
Held to maturity securities: Total Unrealized Losses	4	$ 3
U.S. state and municipal securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity securities: Less than 12 months Fair Value	14
Held to maturity securities: Less than 12 months Unrealized Losses	1
Held to maturity securities: 12 months or longer Fair Value
Held to maturity securities: 12 months or longer Unrealized Losses
Held to maturity securities: Total Fair Value	14
Held to maturity securities: Total Unrealized Losses	$ 1

Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 6
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 6
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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