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Debt (Narrative) (Details)	1 Months Ended		3 Months Ended
	Feb. 28, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) Extension	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Short-term debt			$ 0		$ 0
Carrying value			29,680,000,000		29,471,000,000
Long-term debt repaid			5,042,000,000	$ 1,000,000,000
Loss on early extinguishment of debt			649,000,000	$ 0
Loss on extinguishment of debt, premiums and fees			623,000,000
Write-off of amortized debt discounts and issuance costs, debt extinguishment			26,000,000
Accrued interest on long-term debt			$ 277,000,000		$ 458,000,000
Senior Notes [Member] | USD Denominated Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 5,500,000,000
Senior Notes [Member] | USD Denominated Notes Due 2032 [Member]
Debt Instrument [Line Items]
Face amount	$ 1,750,000,000
Debt instrument, interest rate, stated percentage	2.45%
Senior Notes [Member] | USD Denominated Notes Due 2041 [Member]
Debt Instrument [Line Items]
Face amount	$ 1,500,000,000
Debt instrument, interest rate, stated percentage	3.40%
Senior Notes [Member] | USD Denominated Notes Due 2051 [Member]
Debt Instrument [Line Items]
Face amount	$ 1,250,000,000
Debt instrument, interest rate, stated percentage	3.70%
Senior Notes [Member] | USD Denominated Notes Due 2061 [Member]
Debt Instrument [Line Items]
Face amount	$ 1,000,000,000.00
Debt instrument, interest rate, stated percentage	4.00%
Senior Notes [Member] | USD Denominated Notes, 3.490 Percent, Due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			3.49%
Long-term debt repaid			$ 1,000,000,000.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, covenant, consolidated EBITDA to interest expense ratio, minimum			4.0
Debt instrument, consolidated EBITDA to interest expense ratio			9.2
Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, term			5 years
Face amount			$ 3,000,000,000.0
Debt instrument, number of extensions | Extension			2
Debt instrument, extension term			1 year
Proceeds from issuance of debt		$ 3,000,000,000.0
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.00%
Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	101.00%

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

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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