Equity (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (2,635)	$ (1,989)	$ (2,419)	$ (2,018)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation	(121)	122
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(7)	(4)
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging Gains (Losses)	(81)	(27)
Other comprehensive (loss) income before reclassifications, net	(209)	91
Amounts reclassified, pretax - Foreign Currency Translation	0	0
Amounts reclassified, pretax - Defined Benefit Plan	(44)	(142)
Amounts reclassified, pretax - Unrealized Hedging Gains (Losses)	8	39
Amounts reclassified, pre-tax	(36)	(103)
Tax benefit (expense) - Foreign Currency Translation	(1)	1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	12	38
Tax benefit (expense) - Unrealized Hedging Gains (Losses)	18	2
Income tax benefit related to items of other comprehensive income (loss)	29	41
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(562)	(882)	(440)	(1,005)
Defined Benefit Pension and Post-retirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,065)	(890)	(2,026)	(782)
Unrealized hedging (losses) gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (8)	$ (217)	$ 47	$ (231)