Other Noninterest Income and Noninterest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Noninterest Income
Other fee income	$ 94	$ 100	$ 46
Gain (Loss) on Energy Investments	(85)	(235)	(58)
Other	204	250	252
Total other noninterest income	213	115	240
Noninterest Expense
Fees to affiliates	94	115	105
Net periodic pension cost excluding service cost	(112)	(124)	(119)
Other	440	418	403
Total other noninterest expense	$ 422	$ 409	$ 389