Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ (10,305)
Other comprehensive (loss)/income before reclassifications	$ 119	$ (72)	6	$ (93)
Amounts reclassified from AOCI		(19)	26	(65)
Net current period Other comprehensive income/(loss)	119	(91)	32	(158)
Ending balance	(10,273)		(10,273)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax		(23)		(67)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax		(5)		(18)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(10,392)	(9,617)	(10,305)	(9,550)
Ending balance	(10,273)	(9,708)	(10,273)	(9,708)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(158)	(157)	(134)	(167)
Other comprehensive (loss)/income before reclassifications	54	(39)	30	(29)
Amounts reclassified from AOCI
Net current period Other comprehensive income/(loss)	54	(39)	30	(29)
Ending balance	(104)	(196)	(104)	(196)
Unrealized Gains and Losses on Certain Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	2		2
Other comprehensive (loss)/income before reclassifications	1	1	1	1
Amounts reclassified from AOCI
Net current period Other comprehensive income/(loss)	1	1	1	1
Ending balance	3	1	3	1
Unrealized Gains and Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(38)	(51)	12	(24)
Other comprehensive (loss)/income before reclassifications	63	(35)	(13)	(60)
Amounts reclassified from AOCI		4	26	2
Net current period Other comprehensive income/(loss)	63	(31)	13	(58)
Ending balance	25	(82)	25	(82)
Defined Benefit Pension Plans & Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(10,198)	(9,409)	(10,185)	(9,359)
Other comprehensive (loss)/income before reclassifications	1	1	(12)	(5)
Amounts reclassified from AOCI		(23)		(67)
Net current period Other comprehensive income/(loss)	1	(22)	(12)	(72)
Ending balance	$ (10,197)	$ (9,431)	$ (10,197)	$ (9,431)