Investment Securities (Summary) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 56,455	$ 55,269
Securities available for sale debt securities, unrealized gains	1,211	854
Securities available for sale debt securities, unrealized losses	(251)	(363)
Securities available for sale, fair value	57,415	55,760
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	56,042	54,679
Securities available for sale debt securities, unrealized gains	1,211	854
Securities available for sale debt securities, unrealized losses	(251)	(362)
Securities available for sale, fair value	57,002	55,171
Held to Maturity Securities, Amortized Cost, Total	15,154	14,768
Held-to-maturity securities, unrealized gains	473	311
Held-to-maturity securities, unrealized losses	(19)	(77)
Held-to-maturity securities, fair value	15,608	15,002
AFS to HTM Transfer Net Unrealized Gains In AOCI	90	97
US Treasury and Government Agencies Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	10,237	9,764
Securities available for sale debt securities, unrealized gains	263	152
Securities available for sale debt securities, unrealized losses	(28)	(42)
Securities available for sale, fair value	10,472	9,874
Held to Maturity Securities, Amortized Cost, Total	260	258
Held-to-maturity securities, unrealized gains	57	40
Held-to-maturity securities, fair value	317	298
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	25,241	24,698
Securities available for sale debt securities, unrealized gains	466	250
Securities available for sale debt securities, unrealized losses	(22)	(128)
Securities available for sale, fair value	25,685	24,820
Held to Maturity Securities, Amortized Cost, Total	10,109	9,552
Held-to-maturity securities, unrealized gains	194	101
Held-to-maturity securities, unrealized losses	(7)	(65)
Held-to-maturity securities, fair value	10,296	9,588
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	3,836	3,992
Securities available for sale debt securities, unrealized gains	216	247
Securities available for sale debt securities, unrealized losses	(101)	(88)
Securities available for sale, fair value	3,951	4,151
Held to Maturity Securities, Amortized Cost, Total	227	233
Held-to-maturity securities, unrealized gains	11	8
Held-to-maturity securities, fair value	238	241
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	1,851	1,917
Securities available for sale debt securities, unrealized gains	22	11
Securities available for sale debt securities, unrealized losses	(3)	(10)
Securities available for sale, fair value	1,870	1,918
Held to Maturity Securities, Amortized Cost, Total	1,121	1,128
Held-to-maturity securities, unrealized gains	48	40
Held-to-maturity securities, fair value	1,169	1,168
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	4,727	4,902
Securities available for sale debt securities, unrealized gains	51	30
Securities available for sale debt securities, unrealized losses	(35)	(29)
Securities available for sale, fair value	4,743	4,903
Held to Maturity Securities, Amortized Cost, Total	683	722
Held-to-maturity securities, unrealized gains	18	6
Held-to-maturity securities, unrealized losses		(1)
Held-to-maturity securities, fair value	701	727
Asset Backed Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	5,634	5,417
Securities available for sale debt securities, unrealized gains	45	54
Securities available for sale debt securities, unrealized losses	(54)	(48)
Securities available for sale, fair value	5,625	5,423
Held to Maturity Securities, Amortized Cost, Total	711	717
Held-to-maturity securities, unrealized losses	(11)	(10)
Held-to-maturity securities, fair value	700	707
State and Municipal [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	1,954	1,982
Securities available for sale debt securities, unrealized gains	91	79
Securities available for sale debt securities, unrealized losses	(3)	(5)
Securities available for sale, fair value	2,042	2,056
Held to Maturity Securities, Amortized Cost, Total	1,943	1,954
Held-to-maturity securities, unrealized gains	145	116
Held-to-maturity securities, fair value	2,088	2,070
Other Debt Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	2,562	2,007
Securities available for sale debt securities, unrealized gains	57	31
Securities available for sale debt securities, unrealized losses	(5)	(12)
Securities available for sale, fair value	2,614	2,026
Held to Maturity Securities, Amortized Cost, Total	100	204
Held-to-maturity securities, unrealized losses	(1)	(1)
Held-to-maturity securities, fair value	99	203
Corporate Stocks And Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale equity securities, fair value	413	589
Securities available for sale equity securities, unrealized losses		(1)
Securities available for sale equity securities, amortized cost	$ 413	$ 590

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