Accumulated Other Comprehensive Loss - Changes in AOCL, After Tax and Minority Interest (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 5,184	$ 3,259
Ending balance	5,347	4,411
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,402)	(1,284)
Other comprehensive income (loss) before reclassifications	(169)	2
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(1,571)	(1,282)
Unrealized Gains (Losses) from Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		0
Other comprehensive income (loss) before reclassifications		8
Amounts reclassified from accumulated other comprehensive loss		0
Ending balance		8
Unrecognized Net Actuarial Losses and Prior Service Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2,565)	(2,856)
Other comprehensive income (loss) before reclassifications	14	16
Amounts reclassified from accumulated other comprehensive loss	61	68
Ending balance	(2,490)	(2,772)
Deferred Derivative Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	4	5
Other comprehensive income (loss) before reclassifications	1	0
Amounts reclassified from accumulated other comprehensive loss	(1)	(2)
Ending balance	4	3
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,963)	(4,135)
Other comprehensive income (loss) before reclassifications	(154)	26
Amounts reclassified from accumulated other comprehensive loss	60	66
Ending balance	$ (4,057)	$ (4,043)