Derivative Financial Instruments and Hedging Activities - Schedule of Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,651	$ 1,550	$ 4,886	$ 4,431
Operating expenses	545	478	1,581	1,416
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(70)	241	551	52
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	33	(292)	(684)	(86)
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(84)	(77)	(263)	(161)
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(1)	(3)	(1)	(2)
Interest rate swaps | Fair value hedges | Derivatives designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Hedged items	(92)	(450)	(612)	(258)
Interest rate swaps and Foreign currency swaps	48	396	448	109
Interest rate swaps | Fair value hedges | Derivatives designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	0	0	0	0
Interest rate swaps | Cash flow hedges | Unrealized gain (loss) on hedges
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(2)	(5)	(26)	21
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(3)	(1)	(9)	(8)
Interest rate swaps | Cash flow hedges | Derivatives designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	3	2	11	13
Interest rate swaps | Cash flow hedges | Derivatives designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	0	0	0	0
Foreign currency swaps | Cash flow hedges | Foreign currency translation adjustment
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(68)	246	578	31
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	36	(291)	(675)	(78)
Foreign currency swaps | Cash flow hedges | Derivatives designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	(27)	(27)	(78)	(103)
Foreign currency swaps | Cash flow hedges | Derivatives designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Hedged items	21	(413)	(971)	(205)
Interest rate swaps and Foreign currency swaps	(22)	413	970	207
Interest rate contracts | Derivatives not designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	(17)	2	(31)	77
Interest rate contracts | Derivatives not designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	0	0	0	0
Foreign currency contracts | Derivatives not designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	0	0	0	0
Foreign currency contracts | Derivatives not designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	$ 0	$ (3)	$ 0	$ (3)