CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss)	$ 19	$ 344	$ (1,821)	$ 898
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, amounts arising during the period, net of tax	69	(291)	372	(352)
Qualifying derivatives, amounts arising during the period, net of tax	(9)	28	(39)	36
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax [Abstract]
Defined benefit plan, Net actuarial gain (loss), amounts arising during the period, net of tax	(6)	(1)	(6)	(1)
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):
Qualifying derivatives, net of tax	(1)	(20)	24	(23)
Other Comprehensive (Income) Loss, Defined Benefit Plans, after Reclassification Adjustment, after Tax [Abstract]
Defined benefit plans, Prior service costs, net of tax	(7)	1	(7)	2
Defined benefit plans, Net actuarial (gain) loss, net of tax	67	47	107	94
Total other comprehensive income (loss)	3,691	(236)	4,029	(244)
Comprehensive income (loss)	3,710	108	2,208	654
Foreign currency translation adjustments, net of tax	786	0	786	0
Qualifying derivatives, net of tax	15	0	15	0
Net actuarial (gain) loss, net of tax	2,769	0	2,769	0
Prior service costs, net of tax	$ 8	$ 0	$ 8	$ 0