Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - Significant Accounting Principles: Collateral (Details)

v3.10.0.1
Summary of Significant Accounting Principles - Significant Accounting Principles: Collateral (Details) - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Securities held as collateral, fair value $ 599.0 $ 561.9
Securities received as collateral, amount re-pledged and sold $ 508.6 $ 476.1