Goodwill and Other Intangible Assets (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Number of businesses acquired | item	2
Goodwill, Gross	$ 8,400	$ 8,200
Goodwill, Impaired, Accumulated Impairment Loss	6,500	6,500
Finite-lived intangible assets, period increase (decrease)	423
Amortization of intangibles	94	$ 75	$ 64
Finite lived intangible assets, foreign currency translation gain (loss)	17
Finite-Lived Intangible Assets, Amortization Expense, 2019	115
Finite-Lived Intangible Assets, Amortization Expense, 2020	114
Finite-Lived Intangible Assets, Amortization Expense, 2021	113
Finite-Lived Intangible Assets, Amortization Expense, 2022	111
Finite-Lived Intangible Assets, Amortization Expense, 2023	110
Communications Market Division [Member]
Finite-lived intangible assets acquired	525
Other Acquisition [Member]
Finite-lived intangible assets acquired	$ 9