Borrowings and Contractual Commitments Contractual Commitments (Details) $ in Millions	Dec. 31, 2016 USD ($)
Long-term Purchase Commitment [Line Items]
Other Commitment	$ 26,057
Other Commitment, Due in Second Year	8,786
Other Commitment, Due in Third Year	13,727
Other Commitment, Due in Fourth Year	16,439
Other Commitment, Due in Fifth Year	14,568
Other Commitment, Due after Fifth Year	11,994
Other Commitment	91,571
Purchase Obligation, Due in Next Twelve Months	497	[1]
Purchase Obligation, Due in Second Year	22	[1]
Purchase Obligation, Due in Third Year	20	[1]
Purchase Obligation, Due in Fourth Year	14	[1]
Purchase Obligation, Due in Fifth Year	12	[1]
Purchase Obligation, Due after Fifth Year	219	[1]
Purchase Obligation	784	[1]
Qualified Affordable Housing Project Investments, Commitment	563	[2]
consumer and other time [Member]
Long-term Purchase Commitment [Line Items]
Time Deposit Maturities, Next Twelve Months	3,893	[3],[4]
Time Deposit Maturities, Year Two	1,794	[3],[4]
Time Deposit Maturities, Year Three	1,082	[3],[4]
Time Deposit Maturities, Year Four	983	[3],[4]
Time Deposit Maturities, Year Five	603	[3],[4]
Time Deposit Maturities, after Year Five	1,112	[3],[4]
Time Deposits	9,467	[3],[4]
Brokered Time Deposits [Member]
Long-term Purchase Commitment [Line Items]
Time Deposit Maturities, Next Twelve Months	161	[3]
Time Deposit Maturities, Year Two	102	[3]
Time Deposit Maturities, Year Three	175	[3]
Time Deposit Maturities, Year Four	232	[3]
Time Deposit Maturities, Year Five	131	[3]
Time Deposit Maturities, after Year Five	123	[3]
Time Deposits	924	[3]
Foreign Deposit [Member]
Long-term Purchase Commitment [Line Items]
Time Deposit Maturities, Next Twelve Months	610	[3]
Time Deposit Maturities, Year Two	0	[3]
Time Deposit Maturities, Year Three	0	[3]
Time Deposit Maturities, Year Four	0	[3]
Time Deposit Maturities, Year Five	0	[3]
Time Deposit Maturities, after Year Five	0	[3]
Time Deposits	610	[3]
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 $236 million, $243 million, and $223 million in 2016, 2015, and 2014, 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 10, "Certain Transfers of Financial Assets and Variable Interest Entities," in this Form 10-K for additional information.

[3] Amounts do not include interest.

[4] The aggregate amount of time deposit accounts in denominations of $250,000 or more totaled $1.7 billion and $1.4 billion at December 31, 2016 and 2015, respectively.