Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v3.7.0.1
Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities $ 400 $ 384
Available-for-sale securities 6,764 6,413
Derivative, Collateral, Obligation to Return Cash 146 201
Derivative, Collateral, Right to Reclaim Cash 60 17
Level 1    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 215 202
Available-for-sale securities 1,934 1,655
Derivatives, assets 7 4
Total assets 2,156 1,861
Derivatives, liabilities (5) 11
Total liabilities (5) 11
Level 2    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 117 115
Available-for-sale securities 4,687 4,619
Derivatives, assets 471 878
Total assets 5,275 5,612
Derivatives, liabilities (300) 276
Total liabilities (300) 276
Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 3 4
Available-for-sale securities 143 139
Derivatives, assets 0 0
Total assets 146 143
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 (356) (369)
Total assets (356) (369)
Derivatives, liabilities 273 (192)
Total liabilities 273 (192)
Fair Value Measurements    
Assets and liabilities measured at fair value on a recurring basis    
Trading Securities 400 384
Available-for-sale securities 6,764 6,413
Derivatives, assets 122 513
Total assets 7,286 7,310
Derivatives, liabilities (32) 95
Total liabilities (32) 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 122 166
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 $ 32 $ 53