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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 1,057 $ 1,791 $ 1,721
Other comprehensive income (loss):      
Net unrealized derivative instruments gains (losses) arising during the periods, net of income taxes of $33, $35, ($11),respectively 97 103 (33)
Reclassification adjustment for net derivative (gains) losses included in net income, net of income taxes of ($38), $14, $10, respectively (111) 43 33
Net unrealized debt securities (losses) gains arising during the periods, net of income taxes of ($-124), $165, ($79), respectively 382 501 (239)
Other-than-temporary impairment not recognized in earnings on debt securities, net of income taxes of $0, $0, ($1), respectively 0 0 (3)
Reclassification of net debt securities gains to net income, net of income taxes of $-1, ($8), ($4), respectively (3) (15) (12)
Employee benefit plans:      
Actuarial gain (loss), net of income taxes of $10, $12, ($14), respectively (27) 36 (35)
Amortization of actuarial loss, net of income taxes of $4, $6, $3, respectively 13 13 14
Amortization of prior service cost, net of income taxes of $0, $0, $0, respectively 0 (1) (1)
Total other comprehensive income (loss), net of income taxes 351 680 (276)
Total comprehensive income $ 1,408 $ 2,471 $ 1,445