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Debt - Schedule of Current Portion of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Current portion of debt	$ 4,049	$ 3,385
$3.5 billion credit facility due August 20, 2027
Debt Instrument [Line Items]
Current portion of debt	0	0
Maximum borrowing capacity	3,500
$500 million credit facility due November 16, 2023
Debt Instrument [Line Items]
Current portion of debt	0	0
Maximum borrowing capacity		500
Commercial paper notes
Debt Instrument [Line Items]
Current portion of debt	1,989	0
Maximum borrowing capacity	3,500
3.15%, due January 2023 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 1,000
Interest rate, stated percentage		3.15%
Senior Notes, floating rate, due January 15, 2023 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 250
3.45%, due February 2023 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 625
Interest rate, stated percentage		3.45%
3.50%, due September 2023 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 600
Interest rate, stated percentage		3.50%
5.625%, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 750
Interest rate, stated percentage		5.625%
4.15%, due February 2024 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	$ 650	$ 0
Interest rate, stated percentage	4.15%
4.30%, due May 2024 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	$ 600	0
Interest rate, stated percentage	4.30%
4.25%, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	$ 650	0
Interest rate, stated percentage	4.25%
Trust I Preferred Securities, 4.75%, due March 2028(e) | Capital Trust I
Debt Instrument [Line Items]
Current portion of debt	$ 111	111
Interest rate, stated percentage	4.75%
Current portion of other debt
Debt Instrument [Line Items]
Current portion of debt	$ 49	$ 49

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