Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss by Component, After Tax and Minority Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,403	$ 4,823
Ending balance	3,174	5,003
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,588)	(3,844)
Other comprehensive income (loss) before reclassifications	(4)	26
Amounts reclassified from accumulated other comprehensive income (loss)	23	31
Ending balance	(3,569)	(3,787)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,662)	(1,705)
Other comprehensive income (loss) before reclassifications	(4)	16
Amounts reclassified from accumulated other comprehensive income (loss)	0	10
Ending balance	(1,666)	(1,679)
Unrealized Gains (Losses) from Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1	1
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Ending balance	1	1
Unrecognized Net Actuarial Losses and Prior Service Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,927)	(2,140)
Other comprehensive income (loss) before reclassifications	0	10
Amounts reclassified from accumulated other comprehensive income (loss)	23	21
Ending balance	$ (1,904)	$ (2,109)