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Employee Benefits - Level 3 Roll Forward of Fair Value of Plan Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	$ 1,960
Fair value of plan assets at end of year	2,243
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	39
Distributions	(1)
Fair value of plan assets at end of year	$ 38

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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