Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to expense for defined contribution plans	$ 63	$ 66	$ 58
Estimated contribution to pension plans	77
Net postemployment costs	$ 171	$ 158	144
Postemployment weighted-average discount rate	3.00%	3.10%
Postemployment annual weighted-average turnover rate	3.00%	3.20%
Postemployment percentage increase in assumed compensation cost	2.60%	2.60%
Assets related to postemployment cost	$ 40	$ 38
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	60.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	40.00%
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 9,969	8,557
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	8,962	7,641
Accumulated benefit obligations in excess of plan assets, fair value of plan assets	6,825	5,866
Projected benefit obligations in excess of plan assets, project benefit obligation	10,364	8,807
Projected benefit obligations in excess of plan assets, fair value of plan assets	7,654	6,504
Accrued postemployment costs	10,612	9,152	$ 9,028
Actuarial losses (gains)	(1,430)	(210)
Postemployment [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued postemployment costs	751	$ 708
Actuarial losses (gains)	$ (152)
Pension Plan Portfolio [Member] \| Benefit Obligation [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	4.00%	4.00%
Pension Plan Portfolio [Member] \| Benefit Obligation [Member] \| Switzerland [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	62.00%	60.00%
Pension Plan Portfolio [Member] \| Fair Value Of Plan Assets [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	4.00%	4.00%
Pension Plan Portfolio [Member] \| Fair Value Of Plan Assets [Member] \| Switzerland [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	59.00%	57.00%

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