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Employee Retirement Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined contribution plans [Abstract]
Company contributions to all defined contribution plans expensed		$ 1,000	$ 937	$ 945
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		$ 256	201
Service cost		18	13	11
Interest cost		11	9	7
Benefits paid		(8)	(6)
Actuarial gain		(2)	38
Plan amendments		0	1
APBO at end of period		275	256	201
Effect of a one percentage point change in assumed health care cost trend rates [Abstract]
Increase in total service and interest costs		5
Increase in the APBO		37
Decrease in total service and interest costs		(4)
Decrease in the APBO		(32)
Estimated future benefit payments time period [Abstract]
2017		8
2018		10
2019		11
2020		12
2021		14
Next five years thereafter		101
Reconciliation of funded status to accrued postretirement benefit cost recognized on the balance sheet [Abstract]
Funded status		(275)	(256)
Unrecognized net actuarial gain		5	7
Unrecognized prior service cost		4	7
Accumulated other comprehensive income		(9)	(14)
Cost recognized on Consolidated Balance Sheet		(275)	(256)
Components of periodic postretirement benefit cost [Abstract]
Service cost		18	13	11
Interest cost		11	9	7
Amortization of prior service cost		3	3	3
Recognized actuarial gain		0	0	(3)
Net periodic postretirement benefit cost		$ 32	$ 25	$ 18
Actuarial assumptions used to account for postretirement benefit plans [Abstract]
Weighted-average discount rate (in hundredths)		3.65%	4.25%	4.50%
Assumed healthcare cost trend rates [Abstract]
Assumed healthcare cost trend rate decline (in hundredths)		5.19%
Assumed healthcare cost trend rate	[1]	7.08%	7.08%	7.08%
Year the health care cost trend reaches ultimate rate (year)		2028
[1] The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2018, then decline gradually to 5.19% by 2028 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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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Year ultimate health care cost trend rate is expected to be reached, in CCYY format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
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