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Debt - Borrowings and Repayments, Letters of Credit (Details) - USD ($) $ in Millions		6 Months Ended
	Mar. 01, 2022	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt
Repayments of senior notes		$ 750
Outstanding letters of credit		34		$ 98
3.65% senior notes due June 2022 \| Senior notes
Debt
Stated percentage	3.65%			3.65%
Repayments of senior notes	$ 750
Credit facilities and commercial paper program
Debt
Total borrowings		16,400	$ 26,100
Total repayments		$ 16,300	$ 26,400