Derivatives - Statement of Income Location and Impact of Cash Flow (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cost of sales
Derivatives in Fair Value Hedging Relationships
Total amounts of income and expense line items presented in the consolidated statement of income in which the effects of derivatives are recorded	$ 4,853	$ 4,303	$ 14,097	$ 12,217
Other expense (income), net
Derivatives in Fair Value Hedging Relationships
Total amounts of income and expense line items presented in the consolidated statement of income in which the effects of derivatives are recorded	31	83	113	248
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Cost of sales
Gain or (loss) on derivatives not designated as instruments:
Derivatives not designated as hedging instruments	0	1	0	3
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other expense (income), net
Gain or (loss) on derivatives not designated as instruments:
Derivatives not designated as hedging instruments	(35)	29	(7)	2
Cash flow hedge | Foreign currency forward/option contracts | Cost of sales
Gain or (loss) on cash flow hedging relationships:
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(15)	23	(32)	74
Cash flow hedge | Foreign currency forward/option contracts | Other expense (income), net
Gain or (loss) on cash flow hedging relationships:
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0	0	0	0
Cash flow hedge | Interest rate contracts | Cost of sales
Gain or (loss) on cash flow hedging relationships:
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0	0	0	0
Cash flow hedge | Interest rate contracts | Other expense (income), net
Gain or (loss) on cash flow hedging relationships:
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(3)	(2)	(7)	(6)
Fair value hedges | Interest rate contracts | Cost of sales
Gain or (loss) on fair value hedging relationships:
Hedged items	0	0	0	0
Fair value hedges | Interest rate contracts | Other expense (income), net
Gain or (loss) on fair value hedging relationships:
Hedged items	1	3	3	3
Fair value hedges | Derivatives designated as hedging instruments | Interest rate contracts | Cost of sales
Gain or (loss) on fair value hedging relationships:
Derivatives designated as hedging instruments	0	0	0	0
Fair value hedges | Derivatives designated as hedging instruments | Interest rate contracts | Other expense (income), net
Gain or (loss) on fair value hedging relationships:
Derivatives designated as hedging instruments	$ (1)	$ (3)	$ (3)	$ (3)