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Loans and the Allowance for Credit Losses (Analysis of the Allowance for Credit Losses by Portfolio Segment) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jan. 01, 2020
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period $ 1,976,000,000 $ 1,560,000,000 $ 2,167,000,000 $ 869,000,000  
Provision (credit) for loan and lease losses (332,000,000) 838,000,000 (440,000,000) 1,214,000,000  
Loan losses:          
Charge-offs (83,000,000) (204,000,000) (197,000,000) (348,000,000)  
Recoveries 36,000,000 22,000,000 67,000,000 43,000,000  
Net loan losses (47,000,000) (182,000,000) (130,000,000) (305,000,000)  
Total allowance for loan losses 1,597,000,000 2,276,000,000 1,597,000,000 2,276,000,000  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve For Unfunded Credit Commitments, beginning of period 92,000,000 105,000,000 126,000,000 45,000,000  
Provision (credit) for unfunded credit losses (5,000,000) 44,000,000 (39,000,000) 41,000,000  
Reserve For Unfunded Credit Commitments, end of period 87,000,000 149,000,000 87,000,000 149,000,000  
Allowance for Credit Losses, end of period 1,684,000,000 2,425,000,000 1,684,000,000 2,425,000,000  
Unfunded credit commitments, Change in Method, Credit Loss Expense         $ 63,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)         438,000,000
Portion of ending allowance for loan losses:          
Total allowance for loan losses 1,597,000,000 2,276,000,000 1,597,000,000 2,276,000,000  
Portion of loan portfolio ending balance:          
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL         1,307,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL         108,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   (60,000,000)   (60,000,000)  
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 1,082,000,000 721,000,000 1,196,000,000 537,000,000  
Provision (credit) for loan and lease losses (203,000,000) 622,000,000 (286,000,000) 873,000,000  
Loan losses:          
Charge-offs (36,000,000) (142,000,000) (83,000,000) (213,000,000)  
Recoveries 15,000,000 10,000,000 31,000,000 17,000,000  
Net loan losses (21,000,000) (132,000,000) (52,000,000) (196,000,000)  
Total allowance for loan losses 858,000,000 1,271,000,000 858,000,000 1,271,000,000  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve For Unfunded Credit Commitments, beginning of period 67,000,000 73,000,000 97,000,000 41,000,000  
Provision (credit) for unfunded credit losses (6,000,000) 34,000,000 (36,000,000) 30,000,000  
Reserve For Unfunded Credit Commitments, end of period 61,000,000 107,000,000 61,000,000 107,000,000  
Allowance for Credit Losses, end of period 919,000,000 1,378,000,000 919,000,000 1,378,000,000  
Unfunded credit commitments, Change in Method, Credit Loss Expense         36,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)         (3,000,000)
Portion of ending allowance for loan losses:          
Total allowance for loan losses 858,000,000 1,271,000,000 858,000,000 1,271,000,000  
Portion of loan portfolio ending balance:          
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL         534,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL         77,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   (60,000,000)   (60,000,000)  
Total Investor Real Estate [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 150,000,000 63,000,000 183,000,000 45,000,000  
Provision (credit) for loan and lease losses (57,000,000) 97,000,000 (75,000,000) 107,000,000  
Loan losses:          
Charge-offs (4,000,000) 0 (19,000,000) 0  
Recoveries 2,000,000 0 2,000,000 1,000,000  
Net loan losses (2,000,000) 0 (17,000,000) 1,000,000  
Total allowance for loan losses 91,000,000 160,000,000 91,000,000 160,000,000  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve For Unfunded Credit Commitments, beginning of period 11,000,000 18,000,000 14,000,000 4,000,000  
Provision (credit) for unfunded credit losses 2,000,000 9,000,000 (1,000,000) 10,000,000  
Reserve For Unfunded Credit Commitments, end of period 13,000,000 27,000,000 13,000,000 27,000,000  
Allowance for Credit Losses, end of period 104,000,000 187,000,000 104,000,000 187,000,000  
Unfunded credit commitments, Change in Method, Credit Loss Expense         13,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)         7,000,000
Portion of ending allowance for loan losses:          
Total allowance for loan losses 91,000,000 160,000,000 91,000,000 160,000,000  
Portion of loan portfolio ending balance:          
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL         52,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL         17,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   0   0  
Consumer Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 744,000,000 776,000,000 788,000,000 287,000,000  
Provision (credit) for loan and lease losses (72,000,000) 119,000,000 (79,000,000) 234,000,000  
Loan losses:          
Charge-offs (43,000,000) (62,000,000) (95,000,000) (135,000,000)  
Recoveries 19,000,000 12,000,000 34,000,000 25,000,000  
Net loan losses (24,000,000) (50,000,000) (61,000,000) (110,000,000)  
Total allowance for loan losses 648,000,000 845,000,000 648,000,000 845,000,000  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve For Unfunded Credit Commitments, beginning of period 14,000,000 14,000,000 15,000,000 0  
Provision (credit) for unfunded credit losses (1,000,000) 1,000,000 (2,000,000) 1,000,000  
Reserve For Unfunded Credit Commitments, end of period 13,000,000 15,000,000 13,000,000 15,000,000  
Allowance for Credit Losses, end of period 661,000,000 860,000,000 661,000,000 860,000,000  
Unfunded credit commitments, Change in Method, Credit Loss Expense         14,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal)         434,000,000
Portion of ending allowance for loan losses:          
Total allowance for loan losses $ 648,000,000 845,000,000 $ 648,000,000 845,000,000  
Portion of loan portfolio ending balance:          
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL         721,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL         $ 14,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase   $ 0   $ 0