Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance						$ (9,550)
Other comprehensive income (loss) before reclassifications	[1]	$ (48)		$ (244)		(21)	$ (126)
Amounts reclassified from AOCI	[1]	(19)		127		(46)	298
Net current period Other comprehensive income/(loss)	[1]	(67)		(117)		(67)	172
Ending balance		(9,617)				(9,617)
Amortization of actuarial losses		(2)		155		(4)	314
Amortization of actuarial loss included in net periodic pension cost, tax		1		(44)		1	(84)
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net							39
Loss on discontinuation of cash flow hedge due to forecasted transaction Probable of not occurring, tax							11
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	(9,550)		(11,370)		(9,550)	(11,659)
Ending balance	[1]	(9,617)		(11,487)		(9,617)	(11,487)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(151)		(81)		(167)	(105)
Other comprehensive income (loss) before reclassifications		(6)		(76)		10	(52)
Net current period Other comprehensive income/(loss)		(6)		(76)		10	(52)
Ending balance		(157)		(157)		(157)	(157)
Unrealized Gains and Losses on Certain Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance				1			1
Other comprehensive income (loss) before reclassifications
Net current period Other comprehensive income/(loss)
Ending balance				1			1
Unrealized Gains and Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(11)		135		(24)	6
Other comprehensive income (loss) before reclassifications		(43)		(168)		(25)	(74)
Amounts reclassified from AOCI		3		(5)		(2)	30
Net current period Other comprehensive income/(loss)		(40)		(173)		(27)	(44)
Ending balance		(51)		(38)		(51)	(38)
Defined Benefit Pension Plans & Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(9,388)		(11,425)		(9,359)	(11,561)
Other comprehensive income (loss) before reclassifications		1				(6)
Amounts reclassified from AOCI		(22)	[2]	132	[2]	(44)	268
Net current period Other comprehensive income/(loss)		(21)		132		(50)	268
Ending balance		$ (9,409)		$ (11,293)		$ (9,409)	$ (11,293)

[1] Net of tax.

[2] Primarily relates to amortization of actuarial losses for the six and three months ended June 30, 2022 totaling $314 and $155 (net of tax of ($84) and ($44)), which are included in the net periodic pension cost.