Segment Information (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	4
Revenue	$ 38,469	$ 37,925	$ 39,350
Long-lived assets of non-U.S. operations percent of total	4.00%	4.00%	4.00%
International Operations
Segment Reporting Information [Line Items]
Revenue	$ 4,400	$ 4,300	$ 4,400
Earnings from continuing operations before income tax	$ 588	$ 585	$ 600