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Balance Sheet and Cash Flows Supplemental Information - Additional Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Supplemental non cash information:
Financing activities - Acquisition of noncontrolling interest	$ 125	$ 0
Capital expenditures acquired but not yet paid	$ 28	$ 37

X

- Definition

Future cash outflow to pay for purchases of fixed assets that have occurred.

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- References

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- Definition

Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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