Employment Benefit Plans Other Details (Details) number in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Defined Contribution Plan Disclosure [Line Items]
401(k) matching expense	$ 52	$ 49	$ 41
Multi-employer benefit plans, employer contribution cost	$ 46	$ 46	$ 59
Average number of employees covered under multi-employer benefit plans	31	33	37
Retiree Health and Welfare Benefits
Defined Contribution Plan Disclosure [Line Items]
Projected Benefit Obligation	$ 219	$ 237
Service cost	$ 1	$ 1	$ 1