Securities (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Securities available for sale
One Year or Less	$ 29
Over One Year Through Five Years	783
Over Five Years Through Ten Years	1,995
Over Ten Years	11,856
Total Fair Value	14,663
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies
Securities available for sale
One Year or Less	1
Over One Year Through Five Years	35
Over Five Years Through Ten Years	559
Over Ten Years	7,562
Total Fair Value	8,157
Residential mortgage-backed securities, Privately issued
Securities available for sale
Over Five Years Through Ten Years	5
Over Ten Years	186
Total Fair Value	191
Privately issued - commercial mortgage-backed securities
Securities available for sale
Over Five Years Through Ten Years	35
Over Ten Years	1,778
Total Fair Value	1,813
Collateralized loan obligations
Securities available for sale
Over One Year Through Five Years	263
Over Five Years Through Ten Years	467
Over Ten Years	1,804
Total Fair Value	2,534
Asset-backed and other
Securities available for sale
Over One Year Through Five Years	11
Over Five Years Through Ten Years	8
Total Fair Value	19
Asset Liability Management securities
Securities available for sale
One Year or Less	1
Over One Year Through Five Years	309
Over Five Years Through Ten Years	1,074
Over Ten Years	11,330
Total Fair Value	12,714
Other debt securities, Direct bank purchase bonds
Securities available for sale
One Year or Less	28
Over One Year Through Five Years	457
Over Five Years Through Ten Years	917
Over Ten Years	495
Total Fair Value	1,897
Other debt securities, Other
Securities available for sale
Over One Year Through Five Years	17
Over Five Years Through Ten Years	4
Over Ten Years	31
Total Fair Value	$ 52