Goodwill and Other Intangible Assets, net (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 21,000,000	$ 21,000,000	$ 21,000,000
Estimated future amortization, year 1	20,000,000
Estimated future amortization, year 2	20,000,000
Estimated future amortization, year 3	20,000,000
Estimated future amortization, year 4	20,000,000
Estimated future amortization, year 5	20,000,000
Impairment charges	0	0	0
Changes in goodwill	0	0	$ 0
Accumulated impairment losses related to goodwill and other intangible assets, net	0	$ 0
UST [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived trademarks	9,100,000,000
Middleton [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived trademarks	$ 2,600,000,000
Definite-Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets amortization period, maximum, in years	25 years