Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications			$ 910	$ (524)
Amounts reclassified from accumulated OCI			(1,385)	(1,463)
Net other comprehensive income (loss)			(656)	(1,987)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance			3,529	4,330
Net other comprehensive income (loss)	$ 566	$ (776)	(656)	(1,987)
Accumulated other comprehensive income, ending balance	2,873	2,343	2,873	2,343
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance			(1,964)	(3,926)
Other comprehensive income (loss) before reclassifications			160	108
Amounts reclassified from accumulated OCI			0	0
Net other comprehensive income (loss)			(22)	108
Accumulated other comprehensive income, ending balance	(1,986)	(3,818)	(1,986)	(3,818)
Net Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance			45	111
Other comprehensive income (loss) before reclassifications			(152)	(39)
Amounts reclassified from accumulated OCI			7	(4)
Net other comprehensive income (loss)			(145)	(43)
Accumulated other comprehensive income, ending balance	(100)	68	(100)	68
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance			(1,422)	(779)
Other comprehensive income (loss) before reclassifications			(885)	(593)
Amounts reclassified from accumulated OCI			85	57
Net other comprehensive income (loss)			(824)	(536)
Accumulated other comprehensive income, ending balance	(2,246)	(1,315)	(2,246)	(1,315)
Defined Benefit Postretirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance			6,870	8,924
Other comprehensive income (loss) before reclassifications			1,787	0
Amounts reclassified from accumulated OCI			(1,477)	(1,516)
Net other comprehensive income (loss)			335	(1,516)
Accumulated other comprehensive income, ending balance	$ 7,205	$ 7,408	7,205	$ 7,408
Reclassification out of Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated OCI			(181)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated OCI			(182)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated OCI			0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated OCI			(24)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Postretirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated OCI			$ 25