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Statements of Capital - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance $ 7,548 $ 7,021 $ 7,401
Proceeds from issuance of capital stock 7,205 7,987 5,602
Repurchases/redemptions of capital stock (8,091) (7,588) (6,407)
Net shares reclassified (to) from mandatorily redeemable capital stock (11) (53) (44)
Comprehensive income (loss) 344 430 650
Cash dividends on capital stock (269) (249) (181)
Ending Balance 6,726 7,548 7,021
Additional Capital from Merger [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance 0 0 52
Cash dividends on capital stock   0 (52)
Ending Balance 0 0 0
Retained Earnings, Unrestricted [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance 1,623 1,504 1,219
Comprehensive income (loss) 307 368 414
Cash dividends on capital stock (269) (249) (129)
Ending Balance 1,661 1,623 1,504
Retained Earnings, Restricted [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance 427 335 231
Comprehensive income (loss) 77 92 104
Ending Balance 504 427 335
Retained Earnings [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance 2,050 1,839 1,450
Comprehensive income (loss) 384 460 518
Cash dividends on capital stock (269) (249) (129)
Ending Balance 2,165 2,050 1,839
Accumulated Other Comprehensive Income [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance 84 114 (18)
Comprehensive income (loss) (40) (30) 132
Ending Balance 44 84 114
Common Class B [Member] | Capital Stock (putable) [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance $ 5,414 $ 5,068 $ 5,917
BALANCE (shares) 54 51 59
Proceeds from issuance of capital stock $ 7,205 $ 7,987 $ 5,602
Proceeds from issuance of capital stock (shares) 72 80 56
Repurchases/redemptions of capital stock $ (8,091) $ (7,588) $ (6,407)
Repurchases/redemptions of capital stock (shares) (81) (76) (64)
Net shares reclassified (to) from mandatorily redeemable capital stock $ (11) $ (53) $ (44)
Net shares reclassified (to) from mandatorily redeemable capital stock (shares) 0 (1) 0
Ending Balance $ 4,517 $ 5,414 $ 5,068
BALANCE (shares) 45 54 51