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Income Taxes - Schedule of Components of Consolidated Statements of Income and Equity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Income tax expense | $ 274 | $ 76 | $ 134
Net unrealized gains (losses) on pension and other postretirement plans | 2 | 3 | 5
Net unrealized gains (losses) on securities available for sale | (46) | 25 | 35
Net unrealized gains (losses) on cash flow hedges | (3) | 3 | 5
Total | $ 227 | $ 107 | $ 179

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