Investments in Securities Trading 2 (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Net trading gains (losses)	$ 647	$ 92
Net trading gains (losses) recognized in the period related to securities still held at period end	$ 591	$ 89

Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

No definition available.

Name:	us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration