Shareholders' Equity (Deficit) - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ (28)	$ 58	$ (742)	$ (429)
Other comprehensive income (loss) before reclassifications, net			(158)	213
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			72	98
Tax expense			(19)	(26)
Amounts reclassified from accumulated other comprehensive income, net			53	72
Total other comprehensive income (loss)	(74)	206	(105)	285
Ending balance	6,028	162	6,028	162
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(4,404)	(4,544)	(4,373)	(4,623)
Amounts reclassified from accumulated other comprehensive income
Ending balance	(4,478)	(4,338)	(4,478)	(4,338)
Change in Fair Value of Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			2	(11)
Other comprehensive income (loss) before reclassifications, net			75	7
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			2	6
Tax expense			(1)	(2)
Amounts reclassified from accumulated other comprehensive income, net			1	4
Total other comprehensive income (loss)			76	11
Ending balance	78	0	78	0
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(1,584)	(1,861)
Other comprehensive income (loss) before reclassifications, net			(220)	228
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			0	0
Tax expense			0	0
Amounts reclassified from accumulated other comprehensive income, net			0	0
Total other comprehensive income (loss)			(220)	228
Ending balance	(1,804)	(1,633)	(1,804)	(1,633)
Postretirement Benefit Obligation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(2,791)	(2,751)
Other comprehensive income (loss) before reclassifications, net			(13)	(22)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			70	92
Tax expense			(18)	(24)
Amounts reclassified from accumulated other comprehensive income, net			52	68
Total other comprehensive income (loss)			39	46
Ending balance	$ (2,752)	$ (2,705)	$ (2,752)	$ (2,705)