Business Segment Information - Segments' Total Assets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Segments’ total assets
Total assets	$ 2,187,702	$ 2,144,287
Operating Segments
Segments’ total assets
Total assets	1,975,599	1,876,620
ALM activities
Segments’ total assets
Total assets	613,058	612,364
Liquidating businesses and other
Segments’ total assets
Total assets	117,708	144,310
Elimination of segment asset allocations to match liabilities
Segments’ total assets
Total assets	$ (518,663)	$ (489,007)