Commitments, Guarantees and Contingencies Future Funding Commitments (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commercial mortgage loans	$ 57	$ 31
Consumer lines of credit	1	2
Affordable housing partnerships	59	123
Total funding commitments	$ 117	$ 156