Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (2,931)	$ (3,555)	$ (2,931)	$ (3,555)	$ (2,115)	$ (1,915)	$ (3,921)	$ (3,734)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation	(708)	258	(950)	82
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	14	(14)	3	(24)
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging Gains (Losses)	(199)	108	(168)	62
Other comprehensive (loss) income before reclassifications, net	(893)	352	(1,115)	120
Amounts reclassified, pretax - Foreign Currency Translation	0	0	2	0
Amounts reclassified, pretax - Pension	33	64	65	128
Amounts reclassified, pretax - Unrealized Hedging Gains (Losses)	17	(20)	23	(34)
Amounts reclassified, pre-tax	50	44	90	94
Tax benefit (expense) - Foreign Currency Translation	(6)	2	(9)	(3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(8)	(11)	(12)	(23)
Tax benefit (expense) - Unrealized Hedging Gains (Losses)	41	(21)	30	(9)
Income tax (expense) benefit related to items of other comprehensive income (loss)	27	(30)	9	(35)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(908)	789	(908)	789	(194)	49	529	710
Defined Benefit Pension and Post-retirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,772)	(4,402)	(1,772)	(4,402)	(1,811)	(1,828)	(4,441)	(4,483)
Unrealized hedging (losses) gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (251)	$ 58	$ (251)	$ 58	$ (110)	$ (136)	$ (9)	$ 39