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Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020
Debt Instrument [Line Items]
Interest payable	$ 458,000,000	$ 470,000,000
Repayments of long-term debt	1,000,000,000	$ 1,144,000,000	$ 864,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 1,000,000,000.0
Senior Notes [Member] | Change of Control and Loss of Investment Grade Rating [Member]
Debt Instrument [Line Items]
Required purchase price as percentage of aggregate principal amount	101.00%
USD Denominated Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 2,000,000,000.0
USD Denominated Notes Due 2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 750,000,000
Stated interest rate				2.35%
USD Denominated Notes Due 2030 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 750,000,000
Stated interest rate				3.40%
USD Denominated Notes Due 2050 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 500,000,000
Stated interest rate				4.45%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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