|
Securities - Amortized Cost, Gains and Losses, and Fair Value (Details) (USD $)
|
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2011
United States Treasury And Agency Securities Member
|
Dec. 31, 2011
United States Treasury Securities Exceeding Ten Percent Of Consolidated Shareholders Equity [Member]
|
Dec. 31, 2010
United States Treasury Securities Exceeding Ten Percent Of Consolidated Shareholders Equity [Member]
|
Dec. 31, 2011
Agency Securities [Member]
|
Dec. 31, 2010
Agency Securities [Member]
|
Dec. 31, 2011
Collateralized Mortgage Obligations [Member]
|
Dec. 31, 2010
Collateralized Mortgage Obligations [Member]
|
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
|
Dec. 31, 2010
Residential Mortgage Backed Securities [Member]
|
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
|
Dec. 31, 2010
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
|
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
|
Dec. 31, 2010
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
|
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
|
Dec. 31, 2010
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
|
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
|
Dec. 31, 2010
Commercial Mortgage Backed Securities [Member]
|
Dec. 31, 2011
Non United States Securities [Member]
|
Dec. 31, 2010
Non United States Securities [Member]
|
Dec. 31, 2011
Corporate Bond Securities [Member]
|
Dec. 31, 2010
Corporate Bond Securities [Member]
|
Dec. 31, 2011
Other Debt Obligations [Member]
|
Dec. 31, 2010
Other Debt Obligations [Member]
|
Dec. 31, 2011
Taxable Securities [Member]
|
Dec. 31, 2010
Taxable Securities [Member]
|
Dec. 31, 2011
Tax-exempt securities [Member]
|
Dec. 31, 2010
Tax-exempt securities [Member]
|
Dec. 31, 2011
Debt [Member]
|
Dec. 31, 2010
Debt [Member]
|
Dec. 31, 2009
Debt [Member]
|
Dec. 31, 2008
Debt [Member]
|
Dec. 31, 2011
Equity Securities
|
Dec. 31, 2010
Equity Securities
|
||||||||||
| Debt and Marketable Equity Securities [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Amortized Cost | $ 271,172,000,000 | $ 336,498,000,000 | $ 43,433,000,000 | $ 43,433,000,000 | $ 49,413,000,000 | $ 138,073,000,000 | $ 190,409,000,000 | $ 44,392,000,000 | $ 36,639,000,000 | $ 14,948,000,000 | [1] | $ 23,458,000,000 | $ 4,894,000,000 | $ 6,167,000,000 | $ 4,872,000,000 | $ 4,054,000,000 | $ 2,993,000,000 | $ 5,157,000,000 | $ 12,889,000,000 | $ 15,514,000,000 | $ 266,494,000,000 | $ 330,811,000,000 | $ 4,678,000,000 | $ 5,687,000,000 | ||||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Gains | 242,000,000 | 604,000,000 | 4,511,000,000 | 3,048,000,000 | 774,000,000 | 401,000,000 | 301,000,000 | [1] | 588,000,000 | 629,000,000 | 686,000,000 | 62,000,000 | 92,000,000 | 79,000,000 | 144,000,000 | 49,000,000 | 39,000,000 | 6,647,000,000 | 5,602,000,000 | 15,000,000 | 32,000,000 | 6,662,000,000 | 5,634,000,000 | 10,000,000 | [2] | 10,628,000,000 | ||||||||||||||||||
| Available-for-sale Securities, Gross Unrealized Losses | (811,000,000) | (912,000,000) | (21,000,000) | (2,240,000,000) | (167,000,000) | (23,000,000) | (482,000,000) | [1] | (929,000,000) | (1,000,000) | (1,000,000) | (14,000,000) | (7,000,000) | (37,000,000) | (10,000,000) | (60,000,000) | (161,000,000) | (1,593,000,000) | (4,283,000,000) | (90,000,000) | (222,000,000) | (1,683,000,000) | (4,505,000,000) | (7,000,000) | [2] | (13,000,000) | ||||||||||||||||||
| AFS Debt Securities | 276,151,000,000 | 337,627,000,000 | 42,864,000,000 | 42,864,000,000 | 49,105,000,000 | 142,563,000,000 | 191,217,000,000 | 44,999,000,000 | 37,017,000,000 | 14,767,000,000 | [1] | 23,117,000,000 | 5,522,000,000 | 6,852,000,000 | 4,920,000,000 | 4,139,000,000 | 3,035,000,000 | 5,291,000,000 | 12,878,000,000 | 15,392,000,000 | 271,548,000,000 | 332,130,000,000 | 4,603,000,000 | 5,497,000,000 | ||||||||||||||||||||
| Held-to-maturity debt securities, Amortized Cost | 35,265,000,000 | 427,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Held-to-maturity Securities, Unrecognized Holding Gain | 181,000,000 | [3] | ||||||||||||||||||||||||||||||||||||||||||
| Held-to-maturity Securities, Unrecognized Holding Loss | (4,000,000) | [3] | ||||||||||||||||||||||||||||||||||||||||||
| Held-to-maturity Securities, Fair Value | 35,442,000,000 | 427,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Total Debt Securities Amortized Cost | 306,437,000,000 | 336,925,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Total Debt Securities Gross Unrealized Gains | 6,843,000,000 | 5,634,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Total Debt Securities Gross Unrealized Losses | (1,687,000,000) | (4,505,000,000) | ||||||||||||||||||||||||||||||||||||||||||
| Debt Securities, Fair Value | 311,593,000,000 | 338,054,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Available-for-sale Equity Securities, Amortized Cost Basis | 65,000,000 | [2] | 8,650,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Equity Securities | 68,000,000 | [2] | 19,265,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Table Details [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Available-for-sale Securities, Debt Maturities, Percent Held by Rating | 89.00% | 90.00% | 9.00% | 8.00% | 2.00% | 2.00% | ||||||||||||||||||||||||||||||||||||||
| In Text Details [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | 3,100,000,000 | 3,100,000,000 | 714,000,000 | (628,000,000) | (5,956,000,000) | |||||||||||||||||||||||||||||||||||||||
| Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | 1,900,000,000 | |||||||||||||||||||||||||||||||||||||||||||
| Nonperforming Debt Securities | 140,000,000 | 44,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Gross gains recorded in OCI | $ 9,000,000 | $ 51,000,000 | ||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||