Benefit Plans - Schedule of Amounts Expected to be Amortized from AOCI into Net Periodic Pension Cost During Next Fiscal Year (Details) $ in Millions	Dec. 31, 2021 USD ($)
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ 0
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year	(25)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	(25)
Nonqualified Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	(29)
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year	19
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	$ (10)