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Financial Instruments, Derivatives and Hedging Activities - FV (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying value
Fair value of assets and liabilities
Long-term debt	$ 1,700
Estimate of Fair Value Measurement [Member]
Fair value of assets and liabilities
Long-term debt	1,900
Fair Value, Measurements, Recurring [Member]
Fair value of assets and liabilities
Available for sale securities	12	$ 11
Derivative assets	116	69
Derivative liabilities	37	29
Long-term debt	1,925	1,751
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of assets and liabilities
Available for sale securities	12	11
Derivative assets	28	53
Derivative liabilities	7	3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of assets and liabilities
Derivative assets	88	16
Derivative liabilities	30	26
Long-term debt	$ 1,925	$ 1,751

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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