Shareholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 1,291	$ 4,361	$ 1,158	$ 3,583
Other comprehensive income (loss) before reclassifications, net			(431)	62
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			57	72
Tax expense			(15)	(17)
Amounts reclassified from accumulated other comprehensive income, net			42	55
Net current period other comprehensive income (loss)	(417)	147	(389)	117
Ending Balance	788	4,567	788	4,567
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			(5)	9
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			(4)	1
Tax expense			1	0
Amounts reclassified from accumulated other comprehensive income, net			(3)	1
Net current period other comprehensive income (loss)			(8)	10
Ending Balance	(6)	11	(6)	11
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			(442)	45
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)			(442)	45
Ending Balance	(1,775)	(1,000)	(1,775)	(1,000)
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			16	8
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			61	71
Tax expense			(16)	(17)
Amounts reclassified from accumulated other comprehensive income, net			45	54
Net current period other comprehensive income (loss)			61	62
Ending Balance	(2,479)	(2,755)	(2,479)	(2,755)
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(3,843)	(3,891)	(3,871)	(3,861)
Amounts reclassified from accumulated other comprehensive income
Ending Balance	$ (4,260)	$ (3,744)	$ (4,260)	$ (3,744)