Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v3.5.0.2
Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities $ 379 $ 322
Available-for-sale securities 6,605 8,606
Derivative, Collateral, Obligation to Return Cash 223 184
Derivative, Collateral, Right to Reclaim Cash   17
Level 1    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 199 183
Available-for-sale securities 1,715 3,913
Derivatives, assets 1 2
Total assets 1,915 4,098
Derivatives, liabilities 10 24
Total liabilities 10 24
Level 2    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 113 101
Available-for-sale securities 4,741 4,574
Derivatives, assets 973 1,268
Total assets 5,827 5,943
Derivatives, liabilities 477 635
Total liabilities 477 635
Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 3 2
Available-for-sale securities 149 119
Derivatives, assets 0 0
Total assets 152 121
Derivatives, liabilities 0 0
Total liabilities 0 0
Other [Member]    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 64 36
Available-for-sale securities 0 0
Derivatives, assets 0 0
Total assets 64 36
Derivatives, liabilities 0 0
Total liabilities 0 0
Netting Adjustment    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 0 0
Available-for-sale securities 0 0
Derivatives, assets (573) (638)
Total assets (573) (638)
Derivatives, liabilities (368) (488)
Total liabilities (368) (488)
Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 379 322
Available-for-sale securities 6,605 8,606
Derivatives, assets 401 632
Total assets 7,385 9,560
Derivatives, liabilities 119 171
Total liabilities 119 171
Prepaid expenses and other assets | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, assets   79
Other Assets | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, assets 401 553
Accounts payable and accrued expenses | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, liabilities 9  
Other Liabilities | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, liabilities $ 110 $ 171