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Cost Reduction Programs and Other Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	$ 48	$ 125	$ 428	$ 355
Cost reduction programs and other charges, after-tax and noncontrolling interest	36	90	318	284
Merger-related divestitures		92		213
Other charges, merger related, net of tax		64		169
Cash requirement for the cost reduction program and other charges	338		338
Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges		33		142
Cost reduction programs and other charges, after-tax and noncontrolling interest		$ 26		115
Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	9		98
Other charges, merger related, net of tax	7		82
Other merger related charges for an asset impairment	73			73
Other merger related charges for an asset impairment net of tax and noncontrolling interest	42			$ 42
Cost Reduction Program
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	39		330
Cost reduction program charges	39		330
Cost reduction program charges, net of tax	29		236
Cost Reduction Program | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	31		281
Cost Reduction Program | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	$ 8		$ 49

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