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Employee Benefit Plans - Narrative (Details) $ in Millions		12 Months Ended
Employee Benefit Plans - Narrative (Details) $ in Millions	Dec. 01, 2017 USD ($)	Dec. 31, 2018 USD ($) year	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Cost for defined contribution retirement plans		$ 66	$ 62	$ 59
Postretirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate pension settlement charges		4.21%	3.52%
Requisite employees age \| year		55
Requisite period of service		10 years
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Lump sum pension plan payments to employees		$ 0	$ 0
Non-cash pre-tax pension settlement charge	$ 1
Discount rate used to calculate pension settlement charges	3.83%	2.85%	2.53%	2.70%	4.35%
Expected long-term rate of return on plan assets		4.95%	5.00%	5.40%
Liability interest rate sensitivity		95.00%
Liability inflation rate sensitivity		112.00%
Employer contributions		$ 3
United Kingdom \| Matching Assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation percentage		56.00%
United Kingdom \| Growth Assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation percentage		44.00%
Qualified Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Lump sum pension plan payments to employees	$ 142	$ 0	$ 142
Discount rate used to calculate pension settlement charges				4.35%
Expected long-term rate of return on plan assets				5.58%
Qualified Plan \| United States \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation percentage		82.00%
Defined benefit plan, target allocation percentage to hedge projected liabilities		90.00%
Qualified Plan \| United States \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation percentage		18.00%
Qualified Plan \| United States \| U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation within equity securities		56.00%
Qualified Plan \| United States \| Non-US Equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target allocation within equity securities		44.00%
Nonqualified Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Lump sum pension plan payments to employees		$ 0	$ 0
Discount rate used to calculate pension settlement charges				4.35%
Employer contributions		$ 5
Minimum \| Qualified Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate pension settlement charges		4.18%	3.55%
Expected long-term rate of return on plan assets		3.00%	2.35%
Minimum \| Nonqualified Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate pension settlement charges		3.93%	3.21%
Maximum \| Qualified Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate pension settlement charges		4.39%	3.71%
Expected long-term rate of return on plan assets		5.40%	5.65%
Maximum \| Nonqualified Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate pension settlement charges		4.28%	3.60%