Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amortized intangible assets:
Other intangible assets, gross	$ 2,017	$ 1,770
Other intangible assets, accumulated amortization	709	585
Other intangible assets, net	1,308	1,185
Patents, Trademarks, and Trade Names [Member]
Amortized intangible assets:
Other intangible assets, gross	500	469
Other intangible assets, accumulated amortization	255	228
Other intangible assets, net	245	241
Customer Lists and Other [Member]
Amortized intangible assets:
Other intangible assets, gross	1,517	1,301
Other intangible assets, accumulated amortization	454	357
Other intangible assets, net	$ 1,063	$ 944