Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2022		Dec. 31, 2021		Dec. 31, 2020
Financial Assets:
Cash and cash equivalents, and due from banks, Carrying Value	$ 3,277		$ 2,211		$ 1,948
Cash and cash equivalents and due from banks, Estimated Fair Value	3,277		2,211
FHLB stock, Carrying Value	635	[1]	734	[2]
FHLB stock, Estimated Fair Value	635	[1]	734	[2]
Loans and leases, net, Carrying Value	48,321		45,539
Loans and leases, net, Estimated Fair Value	45,794		44,748
Financial Liabilities:
Deposits, Carrying Value	41,244		35,059
Deposits, Estimated Fair Value	41,091		35,051
Borrowed funds, Carrying Value	14,307		16,562
Borrowed funds, Estimated Fair Value	14,235		17,169
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and cash equivalents, and due from banks, Carrying Value	3,277		2,211
Financial Liabilities:
Deposits, Carrying Value	33,154	[3]	26,635	[4]
Significant Other Observable Inputs (Level 2)
Financial Assets:
FHLB stock, Carrying Value	635	[1]	734	[2]
Financial Liabilities:
Deposits, Carrying Value	7,937	[5]	8,416	[6]
Borrowed funds, Carrying Value	14,235		17,169
Significant Unobservable Inputs (Level 3)
Financial Assets:
Loans and leases, net, Carrying Value	$ 45,794		$ 44,748

[1] Carrying value and estimated fair value are at cost.

[2] Carrying value and estimated fair value are at cost.

[3] Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.

[4] Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.

[5] Certificates of deposit.

[6] Certificates of deposit.