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Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Statement Of Financial Position [Abstract] |  |
Securities Available-for-sale, pledged | $ 1,234 | $ 1,278
Preferred stock, par | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 5,000,000 | 5,000,000
Preferred stock, Series A shares issued | 515,000 | 515,000
Preferred stock, Series A shares outstanding | 515,000 | 515,000
Common stock, par | $ 0.01 | $ 0.01
Common stock, shares authorized | 900,000,000 | 900,000,000
Common stock, shares issued | 490,439,070 | 490,439,070
Common stock, shares outstanding | 465,020,799 | 463,901,808
Treasury stock, shares | 25,418,271 | 26,537,262
Net unrealized (loss) gain on securities available for sale, tax | $ 9 | $ (25)
Net unrealized loss on pension and post-retirement obligations, tax | 19 | 22
Cash flow hedges tax component | 7 | 13
Debt Securities, allowance for credit losses | $ 0 | $ 0

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