Variable Interest Entities (Details) $ in Millions	Mar. 31, 2017 USD ($) investment	Dec. 31, 2016 USD ($)
Consolidated Assets
Other assets	$ 8,927	$ 8,496
Consolidated Liabilities
Other liabilities	2,383	2,520
Consolidated VIEs
Consolidated Assets
Loans held for investment, net	622	641
Other assets	279	286
Total assets	901	927
Consolidated Liabilities
Other liabilities	54	54
Total Liabilities	54	54
Consolidated VIEs | Low-income housing credit investments
Consolidated Assets
Loans held for investment, net	0	0
Other assets	106	112
Total assets	106	112
Consolidated Liabilities
Other liabilities	0	0
Total Liabilities	$ 0	0
Number of LIHC investment fund | investment	2
Consolidated VIEs | Leasing Investments
Consolidated Assets
Loans held for investment, net	$ 622	641
Other assets	173	174
Total assets	795	815
Consolidated Liabilities
Other liabilities	54	54
Total Liabilities	$ 54	$ 54