Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Expenses [Abstract]
Professional services	$ 70	$ 79	$ 235	$ 247
Sales advertising public relations	29	29	83	84
Regulatory fees and assessments	18	14	54	73
Bank operations	9	14	30	53
Insurance	7	7	21	22
Other	135	108	394	347
Total other expenses	$ 268	$ 251	$ 817	$ 826