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Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, Beginning Balance $ 49,216.0 $ 53,879.0 $ 55,726.0 $ 54,041.0
Other comprehensive income (loss), net of tax (2,627.0) 173.0 (8,767.0) (1,307.0)
Equity, Ending Balance 47,688.0 54,685.0 47,688.0 54,685.0
Pretax loss included in AOCI from derivatives (141.0)   (141.0)  
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, Beginning Balance (5,731.0) 1,290.0 409.0 2,770.0
Other comprehensive income (loss), net of tax (2,627.0) 173.0 (8,767.0) (1,307.0)
Equity, Ending Balance (8,358.0) 1,463.0 (8,358.0) 1,463.0
Debt securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, Beginning Balance (4,238.0) 1,549.0 589.0 2,462.0
Other comprehensive income (loss), net of tax (2,075.0) 35.0 (6,902.0) (878.0)
Equity, Ending Balance (6,313.0) 1,584.0 (6,313.0) 1,584.0
Cash flow hedge derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, Beginning Balance (1,545.0) 67.0 (201.0) 659.0
Other comprehensive income (loss), net of tax (536.0) 169.0 (1,880.0) (423.0)
Equity, Ending Balance (2,081.0) 236.0 (2,081.0) 236.0
Pension and  other postretirement benefit plan adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, Beginning Balance 68.0 (322.0) 27.0 (345.0)
Other comprehensive income (loss), net of tax 6.0 (33.0) 47.0 (10.0)
Equity, Ending Balance 74.0 (355.0) 74.0 (355.0)
Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, Beginning Balance (16.0) (4.0) (6.0) (6.0)
Other comprehensive income (loss), net of tax (22.0) 2.0 (32.0) 4.0
Equity, Ending Balance $ (38.0) $ (2.0) $ (38.0) $ (2.0)