Securities Available for Sale and Securities Held to Maturity (Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	$ 65,860	$ 54,520
Securities available for sale Gross Unrealized Gains	218	346
Securities available for sale Gross Unrealized Losses	432	83
Securities available for sale	65,646	54,783
U.S. agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	22,014	18,487
Securities available for sale Gross Unrealized Gains	183	242
Securities available for sale Gross Unrealized Losses	48	12
Securities available for sale	22,149	18,717
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	21,784	19,320
Securities available for sale Gross Unrealized Gains	7	64
Securities available for sale Gross Unrealized Losses	306	18
Securities available for sale	21,485	19,366
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	10,764	8,023
Securities available for sale Gross Unrealized Gains	14	30
Securities available for sale Gross Unrealized Losses	31	8
Securities available for sale	10,747	8,045
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	5,719	2,993
Securities available for sale Gross Unrealized Gains	2	2
Securities available for sale Gross Unrealized Losses	17	1
Securities available for sale	5,704	2,994
U.S. agency notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	3,177	3,839
Securities available for sale Gross Unrealized Losses	27	44
Securities available for sale	3,150	3,795
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	1,685	1,533
Securities available for sale Gross Unrealized Gains	1	1
Securities available for sale Gross Unrealized Losses	3
Securities available for sale	1,683	1,534
U.S. state and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	414
Securities available for sale Gross Unrealized Gains	10
Securities available for sale	424
Non-agency commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	298	310
Securities available for sale Gross Unrealized Gains	1	7
Securities available for sale	299	317
Other securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	5	15
Securities available for sale	$ 5	$ 15

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 320
-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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