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Income Taxes - Tax Rate Analysis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. statutory income tax	$ 711	$ 615	$ 1,060
U.S. statutory income tax rate percentage	21.00%	21.00%	21.00%
State and local taxes – net of federal benefit	$ 21	$ 31	$ 30
State and local taxes - net of federal benefit percentage	0.60%	1.10%	0.60%
U.S. tax credits and deductions	$ (8)	$ (31)	$ (12)
U.S. tax credits and deductions percentage	(0.20%)	(1.10%)	(0.20%)
Foreign tax differentials	$ 167	$ 113	$ 57
Foreign tax rate differentials percentage	4.90%	3.90%	1.10%
Share-Based compensation	$ (53)	$ (41)	$ (22)
Share Based Compensation - percentage	(1.60%)	(1.40%)	(0.40%)
Tax Act	$ 0	$ 0	$ (61)
Tax Act - percentage	0.00%	0.00%	(1.20%)
Divestitures	$ 0	$ 36	$ (321)
Divestitures - net percentage	0.00%	1.20%	(6.40%)
Other – net	$ 9	$ 46	$ 86
Other - net percentage	0.30%	1.60%	1.70%
Income Tax Expense (Benefit)	$ 847	$ 769	$ 817
Provision for income taxes percentage	25.00%	26.30%	16.20%
U.S. tax related GILTI	$ 11	$ 26	$ 34
Unrecognized tax benefits, in Europe			$ 44

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