Pension and Other Employee Benefits (PBO & ABO Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and PRB Plans [Line Items]
ABO for domestic qualified pension plans	$ 26,307	$ 23,447
Domestic Qualified Pension Plan [Member]
Defined Benefit Plans and PRB Plans [Line Items]
PBO for domestic qualified pension plans	26,597	23,359
ABO for domestic qualified pension plans	24,213	21,595
Asset values for domestic qualified pension plans	$ 20,366	$ 18,488

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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