Equity AOCI (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Net unrealized gains on AFS securities for which we have not recorded OTTI, net of tax	$ 127	$ 135
Net unrealized gains on AFS securities for which we have recorded OTTI, net of tax	597	581
Other, net of tax	41	43
Accumulated other comprehensive income	$ 765	$ 759