Derivatives and Hedging Activites (Option Pay/Rec) (Details 3) $ in Millions	Jun. 30, 2021 USD ($)
Summary of Option Premiums Payable and Receivable
Premiums payable	$ 860
Premiums receivable	464
2021
Summary of Option Premiums Payable and Receivable
Premiums payable	78	[1]
Premiums receivable	81	[1]
2022
Summary of Option Premiums Payable and Receivable
Premiums payable	205
Premiums receivable	205
2023
Summary of Option Premiums Payable and Receivable
Premiums payable	51
Premiums receivable	43
2024
Summary of Option Premiums Payable and Receivable
Premiums payable	138
Premiums receivable	25
2025
Summary of Option Premiums Payable and Receivable
Premiums payable	125
Premiums receivable	22
2026-2028
Summary of Option Premiums Payable and Receivable
Premiums payable	263
Premiums receivable	$ 88

[1] 2021 amounts represent the amounts payable and receivable for the period from July 1, 2021 to December 31, 2021.