Accumulated Other Comprehensive Loss - Changes in AOCL, After Tax and Minority Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 5,466	$ 5,184
Ending balance	5,424	5,322
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	34	11
Ending balance	(1,629)	(1,391)
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	(2)	16
Amounts reclassified from accumulated other comprehensive loss	21	24
Ending balance	(2,196)	(2,525)
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	(2)	(2)
Amounts reclassified from accumulated other comprehensive loss		(1)
Ending balance	0	1
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	30	25
Amounts reclassified from accumulated other comprehensive loss	21	23
Ending balance	$ (3,824)	$ (3,915)