Borrowings and Contractual Commitments Contractual Commitments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Long-term Purchase Commitment [Line Items]
Other Commitment, Due in Next Twelve Months	$ 26,122
Other Commitment, Due in Second Year	8,670
Other Commitment, Due in Third Year	11,495
Other Commitment, Due in Fourth Year	14,678
Other Commitment, Due in Fifth Year	22,421
Other Commitment, Due after Fifth Year	12,538
Other Commitment	95,924
Purchase Obligation, Due in Next Twelve Months	249	[1]
Purchase Obligation, Due in Second Year	234	[1]
Purchase Obligation, Due in Third Year	63	[1]
Purchase Obligation, Due in Fourth Year	64	[1]
Purchase Obligation, Due in Fifth Year	58	[1]
Purchase Obligation, Due after Fifth Year	244	[1]
Purchase Obligation	912	[1]
Qualified Affordable Housing Project Investments, Commitment	702	[2]
consumer and other time [Member]
Long-term Purchase Commitment [Line Items]
Time Deposit Maturities, Next Twelve Months	7,781	[3],[4]
Time Deposit Maturities, Year Two	3,262	[3],[4]
Time Deposit Maturities, Year Three	758	[3],[4]
Time Deposit Maturities, Year Four	918	[3],[4]
Time Deposit Maturities, Year Five	363	[3],[4]
Time Deposit Maturities, after Year Five	2,273	[3],[4]
Time Deposits	15,355	[3],[4]
Brokered Time Deposits [Member]
Long-term Purchase Commitment [Line Items]
Time Deposit Maturities, Next Twelve Months	168	[3]
Time Deposit Maturities, Year Two	238	[3]
Time Deposit Maturities, Year Three	241	[3]
Time Deposit Maturities, Year Four	194	[3]
Time Deposit Maturities, Year Five	152	[3]
Time Deposit Maturities, after Year Five	52	[3]
Time Deposits	1,045	[3]
Next Twelve Months [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	702	[2]
Year Two [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
Year Three [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
Year Four [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
Year Five [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	0	[2]
After Year Five [Member]
Long-term Purchase Commitment [Line Items]
Qualified Affordable Housing Project Investments, Commitment	$ 0	[2]

[1] For legally binding purchase obligations of $5 million or more, amounts include either termination fees under the associated contracts when early termination provisions exist, or the total potential obligation over the full contractual term for noncancelable purchase obligations. Payments made towards the purchase of goods or services under these contracts totaled $499 million, $395 million, and $236 million in 2018, 2017, and 2016, respectively.

[2] Commitments to fund investments in affordable housing and other partnerships do not have defined funding dates as certain criteria must be met before the Company is obligated to fund. Accordingly, these commitments are considered to be due on demand for presentation purposes. See Note 12, “Certain Transfers of Financial Assets and Variable Interest Entities,” for additional information.

[3] Amounts do not include interest

[4] The aggregate amount of time deposit accounts in denominations of $250,000 or more was $4.5 billion and $3.2 billion at December 31, 2018 and 2017, respectively.