Accumulated Other Comprehensive Loss - Changes in AOCL, After Tax and Minority Interest (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 5,466	$ 5,184
Ending balance	5,273	5,347
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	31	(169)
Ending balance	(1,632)	(1,571)
Unrealized Gains (Losses) from Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1
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	11	14
Amounts reclassified from accumulated other comprehensive loss	69	61
Ending balance	(2,135)	(2,490)
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)	1
Amounts reclassified from accumulated other comprehensive loss		(1)
Ending balance	(2)	4
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	38	(154)
Amounts reclassified from accumulated other comprehensive loss	69	60
Ending balance	$ (3,768)	$ (4,057)