CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ 207	$ 281	$ (1,614)	$ 1,179
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, amounts arising during the period, net of tax	0	643	372	291
Qualifying derivatives, amounts arising during the period, net of tax	0	(52)	(39)	(16)
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	(12)	(16)	(18)	(17)
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):
Qualifying derivatives, net of tax	1	48	25	25
Other Comprehensive (Income) Loss, Defined Benefit Plans, after Reclassification Adjustment, after Tax [Abstract]
Defined benefit plans, Prior service costs, net of tax	9	0	2	2
Defined benefit plans, Net actuarial (gain) loss, net of tax	10	52	117	146
Total other comprehensive income (loss)	8	675	4,037	431
Comprehensive income (loss)	215	956	2,423	1,610
Foreign currency translation adjustments, net of tax	0	0	786	0
Qualifying derivatives, net of tax	0	0	15	0
Net actuarial (gain) loss, net of tax	0	0	2,769	0
Prior service costs, net of tax	$ 0	$ 0	$ 8	$ 0