Shareholders' Equity (Deficit) - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 788	$ 4,567	$ 1,158	$ 3,583
Other comprehensive income (loss) before reclassifications, net			(1,112)	(96)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			87	105
Tax expense			(23)	(25)
Amounts reclassified from accumulated other comprehensive income, net			64	80
Net current period other comprehensive income (loss)	(659)	(133)	(1,048)	(16)
Ending Balance	(670)	2,299	(670)	2,299
Change in Fair Value of Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			2	1
Other comprehensive income (loss) before reclassifications, net			(13)	4
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			(3)	1
Tax expense			0	0
Amounts reclassified from accumulated other comprehensive income, net			(3)	1
Net current period other comprehensive income (loss)			(16)	5
Ending Balance	(14)	6	(14)	6
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(1,333)	(1,045)
Other comprehensive income (loss) before reclassifications, net			(1,119)	(108)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			0	0
Tax expense			0	0
Amounts reclassified from accumulated other comprehensive income, net			0	0
Net current period other comprehensive income (loss)			(1,119)	(108)
Ending Balance	(2,452)	(1,153)	(2,452)	(1,153)
Postretirement Benefit Obligation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(2,540)	(2,817)
Other comprehensive income (loss) before reclassifications, net			20	8
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			90	104
Tax expense			(23)	(25)
Amounts reclassified from accumulated other comprehensive income, net			67	79
Net current period other comprehensive income (loss)			87	87
Ending Balance	(2,453)	(2,730)	(2,453)	(2,730)
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(4,260)	(3,744)	(3,871)	(3,861)
Amounts reclassified from accumulated other comprehensive income
Ending Balance	$ (4,919)	$ (3,877)	$ (4,919)	$ (3,877)