Accumulated Other Comprehensive Loss - Changes in AOCL, After Tax and Minority Interest (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 5,466	$ 5,184
Ending balance	5,161	5,250
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,663)	(1,402)
Other comprehensive income (loss) before reclassifications	(12)	(334)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(1,675)	(1,736)
Unrealized Gains (Losses) from Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	0
Ending balance	1
Unrecognized Net Actuarial Losses and Prior Service Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2,215)	(2,565)
Other comprehensive income (loss) before reclassifications	4	10
Amounts reclassified from accumulated other comprehensive loss	(92)	(93)
Ending balance	(2,119)	(2,462)
Deferred Derivative Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2	4
Other comprehensive income (loss) before reclassifications	(4)	3
Amounts reclassified from accumulated other comprehensive loss	1	1
Ending balance	(1)	6
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,875)	(3,963)
Other comprehensive income (loss) before reclassifications	(12)	(321)
Amounts reclassified from accumulated other comprehensive loss	(93)	(92)
Ending balance	$ (3,794)	$ (4,192)