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Goodwill and Other Intangible Assets (Changes in Carrying Amounts of Goodwill Attributable to Each Operating Segment) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Goodwill, beginning balance $ 6,078
Other adjustments (1)
Goodwill, ending balance 6,077
Community Banking [Member]
 
Goodwill, beginning balance 4,542
Other adjustments 0
Goodwill, ending balance 4,542
Residential Mortgage Banking [Member]
 
Goodwill, beginning balance 7
Other adjustments 0
Goodwill, ending balance 7
Dealer Financial Services [Member]
 
Goodwill, beginning balance 111
Other adjustments 0
Goodwill, ending balance 111
Specialized Lending [Member]
 
Goodwill, beginning balance 94
Other adjustments 0
Goodwill, ending balance 94
Insurance Services [Member]
 
Goodwill, beginning balance 1,132
Other adjustments (1)
Goodwill, ending balance 1,131
Financial Services [Member]
 
Goodwill, beginning balance 192
Other adjustments 0
Goodwill, ending balance $ 192