Goodwill and Other Intangible Assets, net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Loss Contingencies [Line Items]
Amortization of intangible assets	$ 12	$ 20	$ 28	$ 30	$ 38
Finite-lived intangible assets, amortization expense, next twelve months	63		63
Finite-lived intangible assets, amortization expense, year two	63		63
Finite-lived intangible assets, amortization expense, year three	63		63
Finite-lived intangible assets, amortization expense, year four	63		63
Finite-lived intangible assets, amortization expense, year five	63		63
UST Litigation [Member]
Loss Contingencies [Line Items]
Indefinite-lived trademarks	9,000		9,000
Middleton [Member]
Loss Contingencies [Line Items]
Indefinite-lived trademarks	$ 2,600		$ 2,600
Definite Lived Intangible Assets [Member]
Loss Contingencies [Line Items]
Finite-lived intangible asset, useful life			19 years