Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v3.7.0.1
Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities $ 415 $ 384
Available-for-sale securities 8,042 6,413
Derivative, Collateral, Obligation to Return Cash 140 201
Derivative, Collateral, Right to Reclaim Cash 22 17
Level 1    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 221 202
Available-for-sale securities 2,948 1,655
Derivatives, assets 9 4
Total assets 3,178 1,861
Derivatives, liabilities (1) 11
Total liabilities (1) 11
Level 2    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 120 115
Available-for-sale securities 4,942 4,619
Derivatives, assets 410 878
Total assets 5,472 5,612
Derivatives, liabilities (277) 276
Total liabilities (277) 276
Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 9 4
Available-for-sale securities 152 139
Derivatives, assets 0 0
Total assets 161 143
Derivatives, liabilities 0 0
Total liabilities 0 0
Other [Member]    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 65 63
Available-for-sale securities 0 0
Derivatives, assets 0 0
Total assets 65 63
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 (333) (369)
Total assets (333) (369)
Derivatives, liabilities 215 (192)
Total liabilities 215 (192)
Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 415 384
Available-for-sale securities 8,042 6,413
Derivatives, assets 86 513
Total assets 8,543 7,310
Derivatives, liabilities (63) 95
Total liabilities (63) 95
Prepaid expenses and other assets | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, assets   347
Other Assets | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, assets 86 166
Accounts payable and accrued expenses | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, liabilities   42
Other Liabilities | Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Derivatives, liabilities $ 63 $ 53