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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net income $ 2,521 $ 1,094 $ 1,582
Unrealized losses on securities transferred to held to maturity during the period, net of tax 0 0 0
Less: Reclassification Adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Net of Tax (5) (6) (5)
Net change in unrealized losses on securities transferred to held to maturity, net of tax 5 6 5
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax (629) 592 581
Other comprehensive income (loss), net of tax:      
Less: reclassification adjustments for securities gains (losses) realized in net income (net of tax) 2 3 (21)
Net change in unrealized gains (losses) on securities available for sale, net of tax (631) 589 602
Less: reclassification adjustments for gains (losses) on derivative instruments realized in net income (net of tax) 318 195 (18)
Net change in unrealized gains (losses) on derivative instruments, net of tax   882 385
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 134 (108)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (49) (36) (32)
Net change from defined benefit pension plans and other post employment benefits, net of tax 183 (72) (118)
Other comprehensive income (loss), net of tax (1,026) 1,405 874
Comprehensive income $ 1,495 $ 2,499 $ 2,456