Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to expense for defined contribution plans	$ 71	$ 66	$ 63
Estimated contribution to pension plans	108
Net postemployment costs	$ 228	$ 208	171
Postemployment weighted-average discount rate	3.10%	3.00%
Postemployment annual weighted-average turnover rate	2.90%	3.00%
Postemployment percentage increase in assumed compensation cost	2.10%	2.10%
Assets related to postemployment cost	$ 46	$ 46
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	55.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	45.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 10,400	11,500
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	7,500	10,500
Accumulated benefit obligations in excess of plan assets, fair value of plan assets	5,900	7,700
Projected benefit obligations in excess of plan assets, project benefit obligation	8,600	12,100
Projected benefit obligations in excess of plan assets, fair value of plan assets	6,700	8,600
Accrued postemployment costs	10,998	12,243	$ 10,612
Postemployment Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Accrued postemployment costs	$ 925	$ 923
Pension Plan Portfolio \| Benefit Obligation \| United States
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	4.00%	4.00%
Pension Plan Portfolio \| Benefit Obligation \| Switzerland
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	65.00%	63.00%
Pension Plan Portfolio \| Fair Value Of Plan Assets \| United States
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	3.00%	4.00%
Pension Plan Portfolio \| Fair Value Of Plan Assets \| Switzerland
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	60.00%	59.00%

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