Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value - Realized and Unrealized Gains (Losses) on Financial Instruments (Details)

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Assets And Liabilities Measured At Fair Value - Realized and Unrealized Gains (Losses) on Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net $ (40) $ 16 $ 66 $ (163)
Debt and equity securities        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net (6) 4 210 (109)
Debt measured at fair value        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net (57) 44 (241) 326
Gain (loss) on changes in fair value (46) (193) (114) 109
Cumulative amount of gain in changes in fair value 61   61  
Change in fair value of bond hedges        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net 18 $ (32) 77 (282)
Other derivatives        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net $ 5   $ 20 $ (98)