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Employee Retirement Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined contribution plans [Abstract]
Company contributions to all defined contribution plans expensed		$ 1,000	$ 1,000	$ 937
Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums		65 years
Change in benefit obligation [Roll Forward]
APBO at beginning of period		$ 275	256
Service cost		18	18	13
Interest cost		9	11	9
Benefits paid		(5)	(8)
Actuarial gain		(69)	(2)
Plan amendments		4	0
APBO at end of period		232	275	256
Estimated future benefit payments time period [Abstract]
2019		8
2020		9
2021		10
2022		11
2023		13
Next five years thereafter		93
Reconciliation of funded status to accrued postretirement benefit cost recognized on the balance sheet [Abstract]
Funded status		(232)	(275)
Unrecognized net actuarial (gain) loss		(64)	5
Unrecognized prior service cost		5	4
Accumulated other comprehensive income (loss)		59	(9)
Cost recognized on Consolidated Balance Sheet		(232)	(275)
Components of periodic postretirement benefit cost [Abstract]
Service cost		18	18	13
Interest cost		9	11	9
Amortization of prior service cost		3	3	3
Net periodic postretirement benefit cost		$ 30	$ 32	$ 25
Actuarial assumptions used to account for postretirement benefit plans [Abstract]
Weighted-average discount rate (in hundredths)		4.35%	3.65%	4.25%
Assumed healthcare cost trend rates [Abstract]
Assumed healthcare cost trend rate decline (in hundredths)		5.19%
Assumed healthcare cost trend rate	[1]	7.13%	7.08%	7.08%
Year the health care cost trend reaches ultimate rate (year)		2027
[1] The assumed healthcare cost trend rate is assumed to be 7.13% for 2019, then decline gradually to 5.19% by 2027 and remain level thereafter.

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Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums if they meet minimum levels of service and age requirements set forth by the company or as specified in collective bargaining agreements.

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