Employee Retirement Plans (Changes in Fair Value of Level 3 Assets for Defined Benefit Plans) (Details) - Pension Benefits [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 3,539	$ 3,225
Fair value of plan assets at end of year	3,239	3,539
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	3,004	2,765
Fair value of plan assets at end of year	2,742	3,004
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	535	460
Fair value of plan assets at end of year	497	535
Private Equity Funds [Member] \| United States [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	105	137
Actual return on plan assets relating to assets still held at the reporting date	15	7
Transfers in and/or out of level 3	(38)	(39)
Fair value of plan assets at end of year	82	105
Real Estate [Member] \| United States [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	147	150
Actual return on plan assets relating to assets still held at the reporting date	9	6
Transfers in and/or out of level 3	(8)	(9)
Fair value of plan assets at end of year	148	147
Collateralized Mortgage Backed Securities [Member] \| International [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	16
Transfers in and/or out of level 3	6	16
Fair value of plan assets at end of year	22	16
Insurance Contracts [Member] \| International [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	2	2
Fair value of plan assets at end of year	$ 2	$ 2

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ References

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