v3.26.1
Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Equity, beginning balance $ 60,636 $ 54,469
Other comprehensive income (loss), net of tax (365) 1,328
Equity, ending balance 63,676 56,451
Pretax loss included in AOCI from derivatives 225 271
Total    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Equity, beginning balance (3,408) (6,565)
Other comprehensive income (loss), net of tax (365) 1,328
Equity, ending balance (3,773) (5,237)
Debt securities    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Equity, beginning balance (3,303) (5,099)
Other comprehensive income (loss), net of tax (120) 703
Equity, ending balance (3,423) (4,396)
Cash flow hedge derivatives    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Equity, beginning balance (181) (1,314)
Other comprehensive income (loss), net of tax (251) 625
Equity, ending balance (432) (689)
Pension and other postretirement benefit plan adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Equity, beginning balance 118 (109)
Other comprehensive income (loss), net of tax 6 (1)
Equity, ending balance 124 (110)
Other    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Equity, beginning balance (42) (43)
Other comprehensive income (loss), net of tax 0 1
Equity, ending balance $ (42) $ (42)