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Regulatory Requirements (Regulatory Capital and Ratios) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Tier 1 Risk-Based Capital    
Actual Amount $ 7,700us-gaap_TierOneRiskBasedCapital $ 6,550us-gaap_TierOneRiskBasedCapital
Minimum Capital Requirement Amount 1,397us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 1,383us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Minimum to be Well Capitalized Amount 2,095us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized 2,074us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Actual Ratio 22.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 19.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Minimum Capital Requirement Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Minimum to be Well Capitalized Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Total Risk-Based Capital    
Actual Amount 7,744us-gaap_Capital 6,599us-gaap_Capital
Minimum Capital Requirement Amount 2,793us-gaap_CapitalRequiredForCapitalAdequacy 2,766us-gaap_CapitalRequiredForCapitalAdequacy
Minimum to be Well Capitalized Amount 3,492us-gaap_CapitalRequiredToBeWellCapitalized 3,457us-gaap_CapitalRequiredToBeWellCapitalized
Actual Ratio 22.20%us-gaap_CapitalToRiskWeightedAssets 19.10%us-gaap_CapitalToRiskWeightedAssets
Minimum Capital Requirement Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Minimum to be Well Capitalized Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier 1 Leverage    
Actual Amount 7,700us-gaap_TierOneLeverageCapital 6,550us-gaap_TierOneLeverageCapital
Minimum Capital Requirement Amount 4,438us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 3,994us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Minimum to be Well Capitalized Amount 5,548us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized 4,993us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Actual Ratio 6.90%us-gaap_TierOneLeverageCapitalToAverageAssets 6.60%us-gaap_TierOneLeverageCapitalToAverageAssets
Minimum Capital Requirement Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Minimum to be Well Capitalized Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Tangible Equity    
Actual Amount 7,700us-gaap_TangibleCapital 6,550us-gaap_TangibleCapital
Minimum Capital Requirement Amount $ 2,219us-gaap_TangibleCapitalRequiredForCapitalAdequacy $ 1,997us-gaap_TangibleCapitalRequiredForCapitalAdequacy
Actual Ratio 6.90%us-gaap_TangibleCapitalToTangibleAssets 6.60%us-gaap_TangibleCapitalToTangibleAssets
Minimum Capital Requirement Ratio 2.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets 2.00%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets