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Borrowings and Contractual Commitments Long-term debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term Debt [1] $ 8,462 $ 13,022
Parent Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt 4,772 4,815
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,038  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,232  
Long-term Debt, Maturities, Repayments of Principal in Year Three 874  
Long-term Debt, Maturities, Repayments of Principal in Year Four 792  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal after Year Five 836  
Parent Company [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount 3,614 3,630
Long-term Debt, Percentage Bearing Variable Interest, Amount 331 358
Parent Company [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount $ 200 200
Parent Company [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Amount   627
Parent Company [Member] | Fixed Interest Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Apr. 15, 2016  
Debt Instrument, Maturity Date Range, End Jan. 15, 2028  
Parent Company [Member] | Fixed Interest Rate Debt [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Feb. 15, 2026  
Debt Instrument, Maturity Date Range, End Feb. 15, 2026  
Parent Company [Member] | Variable Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Mar. 16, 2016  
Debt Instrument, Maturity Date Range, End Aug. 01, 2019  
Parent Company [Member] | Variable Rate Debt [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Apr. 01, 2027  
Debt Instrument, Maturity Date Range, End Mar. 15, 2028  
Subsidiaries [Member]    
Debt Instrument [Line Items]    
Long-term Debt [2] $ 3,690 8,207
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 73  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,711  
Long-term Debt, Maturities, Repayments of Principal in Year Three 502  
Long-term Debt, Maturities, Repayments of Principal in Year Four 33  
Long-term Debt, Maturities, Repayments of Principal in Year Five 226  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,145  
Subsidiaries [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount [2],[3] 1,620 5,682
Long-term Debt, Percentage Bearing Variable Interest, Amount [2] 1,097 742
Subsidiaries [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount [2],[4] 973 1,283
Long-term Debt, Percentage Bearing Variable Interest, Amount [2] $ 0 $ 500
Subsidiaries [Member] | Fixed Interest Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Apr. 01, 2016  
Debt Instrument, Maturity Date Range, End Dec. 29, 2053  
Subsidiaries [Member] | Fixed Interest Rate Debt [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Jan. 17, 2017  
Debt Instrument, Maturity Date Range, End Apr. 01, 2020  
Subsidiaries [Member] | Variable Rate Debt [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Range, Start Jun. 27, 2016  
Debt Instrument, Maturity Date Range, End Dec. 19, 2043  
Minimum [Member] | Parent Company [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.48%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.35%  
Minimum [Member] | Parent Company [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.00%  
Minimum [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.03%  
Minimum [Member] | Subsidiaries [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.44%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.80%  
Minimum [Member] | Subsidiaries [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.20%  
Maximum [Member] | Parent Company [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.86%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.00%  
Maximum [Member] | Parent Company [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.00%  
Maximum [Member] | Parent Company [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.31%  
Maximum [Member] | Subsidiaries [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.23%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 9.65%  
Maximum [Member] | Subsidiaries [Member] | Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 7.25%  
[1] Includes debt of consolidated VIEs of $259 million and $302 million at December 31, 2015 and December 31, 2014, respectively.
[2] 81% and 90% of total subsidiary debt was issued by the Bank as of December 31, 2015 and 2014, respectively.
[3] Includes leases and other obligations that do not have a stated interest rate.
[4] Debt recorded at fair value.