Condensed Balance Sheet (Parent Company Only) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and equivalents	$ 2,233	$ 1,783	$ 1,838	$ 2,762
Property and equipment, net	236	245
Deferred tax assets, net	1,033	951
Other assets	769	836
Total assets	45,427	45,530	46,280
LIABILITIES AND SHAREHOLDERS’ EQUITY
Corporate debt	997	1,366
Other liabilities	575	774
Total liabilities	39,628	40,155
Total shareholders’ equity	5,799	5,375	4,856	4,904
Total liabilities and shareholders’ equity	45,427	45,530
Parent Company [Member]
ASSETS
Cash and equivalents	432	220	$ 406	$ 400
Property and equipment, net	156	165
Investment in consolidated subsidiaries	5,434	5,763
Receivable from subsidiaries	57	31
Deferred tax assets, net	739	335
Other assets	173	410
Total assets	6,991	6,924
LIABILITIES AND SHAREHOLDERS’ EQUITY
Corporate debt	997	1,366
Other liabilities	195	183
Total liabilities	1,192	1,549
Total shareholders’ equity	5,799	5,375
Total liabilities and shareholders’ equity	$ 6,991	$ 6,924