Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 1,332	$ 1,522	$ 1,668
Other income (expense), net	(246)	62	76
Gain on sale of businesses	773	0	0
Total before tax	991	(2,701)	782
Attributable to income	557	668	450
Net of tax	1,548	(2,033)	$ 1,232
Decrease (Increase) in Net Income/Loss | Interest rate swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	22	83
Attributable to income	(5)	(20)
Net of tax	17	63
Decrease (Increase) in Net Income/Loss | Defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of businesses	(539)
Total before tax	658	579
Attributable to income	(165)	(142)
Net of tax	493	437
Decrease (Increase) in Net Income/Loss | Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	121	190
Decrease (Increase) in Net Income/Loss | Settlement charge
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net		383
Decrease (Increase) in Net Income/Loss | Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	(2)	$ 6
Decrease (Increase) in Net Income/Loss | Foreign currency adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of businesses	(112)
Attributable to income	0
Net of tax	$ 112