Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (3,325)	$ (17,016)	$ (3,914)	$ (17,228)
Other comprehensive income/(loss) before reclassifications	198	1	312	(113)
Amounts reclassified from AOCI	23	19	64	26
Net current period Other comprehensive income	221	20	376	(87)
Ending balance	(3,296)	(17,982)	(3,296)	(17,982)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(10,760)	(10,412)	(10,915)	(10,305)
Ending balance	(10,539)	(10,392)	(10,539)	(10,392)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(132)	(169)	(178)	(134)
Other comprehensive income/(loss) before reclassifications	62	11	108	(24)
Amounts reclassified from AOCI
Net current period Other comprehensive income	62	11	108	(24)
Ending balance	(70)	(158)	(70)	(158)
Unrealized Gains and Losses on Certain Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	2	2	2	2
Other comprehensive income/(loss) before reclassifications
Amounts reclassified from AOCI
Net current period Other comprehensive income
Ending balance	2	2	2	2
Unrealized Gains and Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(125)	(46)	(211)	12
Other comprehensive income/(loss) before reclassifications	138	(11)	206	(76)
Amounts reclassified from AOCI	10	19	28	26
Net current period Other comprehensive income	148	8	234	(50)
Ending balance	23	(38)	23	(38)
Defined Benefit Pension Plans & Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(10,505)	(10,199)	(10,528)	(10,185)
Other comprehensive income/(loss) before reclassifications	(2)	1	(2)	(13)
Amounts reclassified from AOCI	13		36
Net current period Other comprehensive income	11	1	34	(13)
Ending balance	$ (10,494)	$ (10,198)	$ (10,494)	$ (10,198)