Employee Benefit Plans - Narrative (Details) - Defined Benefit Plans - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
EMPLOYEE BENEFIT PLANS
Projected benefit obligation	$ 1,100	$ 1,021	$ 1,136
Fair value of plan assets	934	813	$ 906
U.S. Plans
EMPLOYEE BENEFIT PLANS
Projected benefit obligation	$ 11	$ 10
Percentage of US portion of projected benefit obligation	1.00%	1.00%
Fair value of plan assets	$ 8	$ 7
Percentage of US portion of fair value of plan assets	1.00%	1.00%

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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Percentage of US portion of benefit obligation for defined benefit plan

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