Employee Benefit Plans (Actual & Target Allocation of Fair Value by Asset Class) (Details) - UNITED STATES	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Actual	100.00%	100.00%
Pension Benefits | Fixed maturity securities AFS
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Target	85.00%
Actual	82.00%	83.00%
Pension Benefits | Equity Securities
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Target	7.00%
Actual	6.00%	6.00%
Pension Benefits | Alternative Securities
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Target	8.00%
Actual	12.00%	11.00%
Other Postretirement Benefits
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Actual	100.00%	100.00%
Other Postretirement Benefits | Fixed maturity securities AFS
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Target	95.00%
Actual	94.00%	96.00%
Other Postretirement Benefits | Equity Securities
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Target	5.00%
Actual	6.00%	4.00%
Other Postretirement Benefits | Alternative Securities
Actual weighted average asset allocation by major asset class for the Invested Plans [Abstract]
Target	0.00%
Actual	0.00%	0.00%