v3.22.0.1
Stockholders' Equity and Accumulated Other Comprehensive Income (Loss)(Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start $ 1,759 $ (120) $ (1,289)
Other Comprehensive Income (Loss), before Tax (1,372) 1,879 1,169
Pre-tax AOCI activity, Period End 387 1,759 (120)
Tax Effect, period start [1] (444) 30 325
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax 212 (200) (196)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax (1) (1) 7
Net actuarial gains and losses arising during the period, tax 46 (36) (50)
Other Comprehensive Income (Loss), Tax [1] 346 (474) (295)
Tax Effect, period end (98) (444) [1] 30 [1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 1,315 (90) (964)
Unrealized holding gains (losses) arising during the period on securities available for sale, net of tax (629) 592 581
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax (631) 589 602
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) 2 3 (21)
Net change in unrealized gains (losses) on derivative instruments, net of tax   882 385
Net actuarial gains (losses) arising during the period (net of tax) 134 (108)  
Other comprehensive income (loss), net of tax (1,026) 1,405 874
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End 289 1,315 (90)
Accumulated Net Unrealized Loss on Held To Maturity Securities [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start (21) (29) (36)
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, before Tax [2] 7 8 7
Pre-tax AOCI activity, Period End (14) (21) (29)
Tax Effect, period start [1] 5 7 9
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, Tax [1],[2] (2) (2) (2)
Tax Effect, period end [1] 3 5 7
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (16) (22) (27)
Reclassification adjustments for Amortization of Unrealized Losses on Securities Transferred to Held to Maturity (net of tax) [2] 5 6 5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (11) (16) (22)
Accumulated Net Unrealized Securities Available For Sale Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start 1,062 274 (531)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax (841) 792 777
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax (3) [3] (4) [3] 28
Other Comprehensive Income (Loss), before Tax (844) 788 805
Pre-tax AOCI activity, Period End 218 1,062 274
Tax Effect, period start [1] (268) (69) 134
Unrealized holding gains (losses) arising during the period on securities available for sale, Tax [1] (212) 200 196
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 1 [1],[3] 1 [1],[3] (7)
Other Comprehensive Income (Loss), Tax 213 [1] (199) [1] (203)
Tax Effect, period end [1] (55) (268) (69)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 794 205 (397)
Reclassification adjustments for securities gains (losses) realized in net income (net of tax) (2) [3] (3) [3] 21
Other comprehensive income (loss), net of tax (631) 589  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End 163 794 205
Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start 1,610 430 (84)
OCI, before Reclassifications, before Tax, Attributable to Parent (354) 1,440 490
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent [2] 426 260 (24)
Other Comprehensive Income (Loss), before Tax (780) 1,180 514
Pre-tax AOCI activity, Period End 830 1,610 430
Tax Effect, period start [1] (406) (108) 21
OCI, before reclassifications, tax, attributable to parent [1] 89 (363) (123)
Reclassification from AOCI, Current Period, Tax [1],[2] (108) (65) 6
Other Comprehensive Income (Loss), Tax [1] 197 (298) (129)
Tax Effect, period end [1] (209) (406) (108)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 1,204 322 (63)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (265) 1,077 367
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent [2] 318 195 (18)
Net change in unrealized gains (losses) on derivative instruments, net of tax (583)    
Other comprehensive income (loss), net of tax   882 385
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End 621 1,204 322
Accumulated Defined Benefit Pension Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Pre-tax AOCI activity, Period Start (892) (795) (638)
Net actuarial gains (losses) arising during the period, before tax 180 (144) (200)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, before Tax [4] 65 47 43
Other Comprehensive Income (Loss), before Tax 245 (97) (157)
Pre-tax AOCI activity, Period End (647) (892) (795)
Tax Effect, period start [1] 225 200 161
Net actuarial gains and losses arising during the period, tax [1] (46) 36 50
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income, Tax [1],[4] (16) (11) (11)
Other Comprehensive Income (Loss), Tax [1] (62) 25 39
Tax Effect, period end [1] 163 225 200
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (667) (595) (477)
Net actuarial gains (losses) arising during the period (net of tax)     (150)
Reclassification adjustments for amortization of actuarial (gains) losses and settlements realized in net income (net of tax) [4] 49 36 32
Other comprehensive income (loss), net of tax 183 (72) (118)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (484) $ (667) $ (595)
[1] The impact of all AOCI activity is shown net of the related tax impact, calculated using an effective tax rate of approximately 25%.
[2] Reclassification amount is recognized in net interest income in the consolidated statements of income.
[3] Reclassification amount is recognized in securities gains (losses), net in the consolidated statements of income.
[4] Reclassification amount is recognized in other non-interest expense in the consolidated statements of income. Additionally, these accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost (see Note 17 for additional details).