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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period	$ 31,088
Other Comprehensive Income (Loss)	(481)	$ (879)	$ (1,192)
End of the period	32,784	31,088
Accumulated Other Comprehensive Income (Loss):
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period	(8,465)	(7,586)
Other comprehensive income (loss) before reclassifications	(598)	(729)
(Income) loss amounts reclassified from accumulated other comprehensive income	117	(150)
Other Comprehensive Income (Loss)	(481)	(879)	(1,192)
End of the period	(8,946)	(8,465)	(7,586)
Cumulative Foreign Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period	(4,924)	(4,912)
Other comprehensive income (loss) before reclassifications	65	(12)
Other Comprehensive Income (Loss)	65	(12)
End of the period	(4,859)	(4,924)	(4,912)
Net Actuarial (Losses) and Prior Service (Costs) and Credits
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period	(3,540)	(2,726)
Other comprehensive income (loss) before reclassifications	(523)	(719)
(Income) loss amounts reclassified from accumulated other comprehensive income	192	(95)
Other Comprehensive Income (Loss)	(331)	(814)
End of the period	(3,871)	(3,540)	(2,726)
Cumulative Gains (Losses) on Derivative Instruments Designated as Cash Flow Hedges
Changes in accumulated other comprehensive income (loss), net of income taxes
Beginning of the period	(1)	52
Other comprehensive income (loss) before reclassifications	(140)	2
(Income) loss amounts reclassified from accumulated other comprehensive income	(75)	(55)
Other Comprehensive Income (Loss)	(215)	(53)
End of the period	$ (216)	$ (1)	$ 52

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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