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Employee Benefit Plans - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) investment_pool	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined contribution plans	$ 38	$ 65	$ 44
Employer contribution (as percent)	100.00%
Employee contribution (as percent)	1.00%
Employer contribution (as percent)	25.00%
Employer contribution (as percent)	4.00%
U.S. and other plans
Defined Benefit Plan Disclosure [Line Items]
Company contribution	$ 5	0
Plan assets investments	$ 181	167	0
U.S. and other plans | On-risk assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets target allocation percentage	50.00%
U.S. and other plans | Off-risk assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets target allocation percentage	50.00%
U.K. plan
Defined Benefit Plan Disclosure [Line Items]
Company contribution	$ 0	0
Number of plan asset investment pools | investment_pool	2
Plan assets investments	$ 974	860	$ 0
U.K. plan | On-risk assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets target allocation percentage	50.00%
U.K. plan | Off-risk assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets target allocation percentage	50.00%
Fair Value Measured at Net Asset Value Per Share | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets investments	$ 227	$ 48

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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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