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Employee Benefits - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pre-Medicare company contribution for retiree medical coverage, maximum percent	4.00%
Contribution to other post retirement plans	$ 128
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contributions by employer to employee pension plan	1,200
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contributions by employer to employee pension plan	1,070
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions during the remaining of fiscal year	$ 47

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- Definition

Maximum annual increase percentage to Company contribution for retiree medical coverage.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of cash outflow for other postretirement benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes pension benefit.

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