Income Taxes Income Taxes - Deferred Tax Balances (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Assets
Deferred Tax Assets, Tax Loss And Tax Credit Carryforwards	[1]	$ 761	$ 761	$ 842
Deferred Tax Assets, Accrued Employee Benefits		1,717	1,717	1,392
Deferred Tax Assets, Other Accruals and Reversals		135	135	263
Deferred Tax Assets, Inventory		25	25
Deferred Tax Assets, Long-Term Debt				24
Deferred Tax Assets, Investments		53	53	7
Deferred Tax Assets, Other		279	279	137
Deferred Tax Assets, Gross		2,970	2,970	2,665
Deferred Tax Assets, Valuation Allowance	[2]	(457)	(457)	(669)
Deferred Tax Assets, Net of Valuation Allowance		2,513	2,513	1,996
Liabilities
Deferred Tax Liabilities, Property		369	369	344
Deferred Tax Liabilities, Intangible Assets		2,738	2,738	2,648
Deferred Tax Liabilities, Inventory				40
Deferred Tax Liabilities, Unrealized Exchange Gains/Losses		39	39	140
Deferred Tax Liabilities, Gross		3,146	3,146	3,172
Net Deferred Tax Liability		(633)	(633)	(1,176)
Swiss VA [Member]
Liabilities
Other Tax Benefit (Expense)		$ 34	$ 34
Brazil Valuation Allowance [Member]
Liabilities
Other Tax Benefit (Expense)				$ (75)

[1] Primarily related to the realization of recorded tax benefits on tax loss and credit carryforwards from operations in the United States, Brazil, and Spain.

[2] During the year ended December 31, 2019, the company released a valuation allowance against the net deferred tax asset position of a legal entity in Switzerland in connection with an internal merger, resulting in a tax benefit of $34 million. During the year ended December 31, 2018, the company established a full valuation allowance against the net deferred tax asset position of a legal entity in Brazil due to revised financial projections, resulting in tax expense of $75 million. See Note 15 - Goodwill and Other Intangible Assets, for additional information.