Indebtedness (Long-Term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 27,581	$ 31,292
Less current portion of long-term debt	2,798	3,124
Long-term debt	24,783	28,168
Finance leases	$ 71	37
US Dollar Notes
Debt Instrument [Line Items]
Average interest rate	3.245%
Total long-term debt	$ 19,397	21,221
Foreign Currency Obligations | Euro Notes Payable
Debt Instrument [Line Items]
Average interest rate	1.995%
Total long-term debt	$ 7,687	9,253
Foreign Currency Obligations | Swiss Franc Notes
Debt Instrument [Line Items]
Interest rate, stated rate (as a percent)	1.625%
Total long-term debt	$ 273	622
Foreign Currency Obligations | Other
Debt Instrument [Line Items]
Average interest rate	3.329%
Total long-term debt	$ 224	$ 196
Minimum | US Dollar Notes
Debt Instrument [Line Items]
Interest rate, stated rate (as a percent)	0.875%
Minimum | Foreign Currency Obligations | Euro Notes Payable
Debt Instrument [Line Items]
Interest rate, stated rate (as a percent)	0.125%
Maximum | US Dollar Notes
Debt Instrument [Line Items]
Interest rate, stated rate (as a percent)	6.375%
Maximum | Foreign Currency Obligations | Euro Notes Payable
Debt Instrument [Line Items]
Interest rate, stated rate (as a percent)	3.125%