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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
markets
Dec. 31, 2014
USD ($)
Number of Primary Geographic Markets | markets   3  
Minimum Ownership Percentage to Qualify for Equity Method   20.00%  
Derivative assets   $ 818 $ 894
Commitments to fund additional investments in nonmarketable equity securities   $ 4  
Estimated liquidation period of assets underlying indirect private equity and venture capital funds   12 years  
Federal Home Loan Bank Stock   $ 7 7
Federal Reserve Bank Stock   85 85
Net Deferred Income on Originated Loans   226 267
Allowance for Credit Losses, Threshold for Individual Evaluation, Nonaccrual Loans   $ 2  
Increase in Allowance due to Enhancements to Methodology $ 40    
Delinquency Status, Period of Unpaid Scheduled Monthly Payment   30 days  
Number of Reporting Units   3  
Notional Amount [1]   $ 20,764 21,562
Defined Benefit Plan Market-related Value Plan Assets, Amortization Period   5 years  
Defined Benefit Plan Investment Gain Loss Amortization Adjustment, Allowable Percentage   10.00%  
Defined Benefit Plan Actuarial Gain Loss Amortization Adjustment, Allowable Percentage   10.00%  
Premises the Corporation owns | Minimum      
Premises and Equipment, Useful Life   3 years  
Premises the Corporation owns | Maximum      
Premises and Equipment, Useful Life   33 years  
Furniture and equipment | Minimum      
Premises and Equipment, Useful Life   3 years  
Furniture and equipment | Maximum      
Premises and Equipment, Useful Life   8 years  
Leasehold improvements | Maximum      
Premises and Equipment, Useful Life   10 years  
Software      
Premises and Equipment, Useful Life   5 years  
Recurring      
Derivative assets   $ 820 898
Carrying Amount      
Nonmarketable equity securities   10 11 [2]
Warrants | Recurring      
Derivative assets   $ 2 $ 4
Retail loans | Real estate      
Past Due Period Residential Mortgage And Home Equity Loans Placed On Nonaccrual Status   90 days  
Past Due Threshold For Charge-Off   180 days  
Short-Cut Method | Designated as Hedging Instrument | Interest Rate Swaps | Fair Value Hedging      
Notional Amount   $ 400  
Commercial borrower | Business loans      
Past Due Period Business Loans Placed On Nonaccrual Status   90 days  
Consumer borrower | Retail loans | Home equity      
Maximum Past Due Status Junior Lien Home Equity Placed On Nonaccrual Status   90 days  
Consumer borrower | Retail loans | Other consumer      
Past Due Threshold For Charge-Off   120 days  
Threshold, Days Past Due, Other Consumer Placed On Nonaccrual Status   90 days  
[1] Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.
[2] Included $1 million and $2 million of nonmarketable equity securities recorded at fair value on a nonrecurring basis at December 31, 2015 and 2014, respectively.