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Debt and Derivative Instruments (Narrative) (Details)	1 Months Ended			12 Months Ended
	Mar. 24, 2021 USD ($)	Jan. 31, 2021 USD ($) tranche	Mar. 31, 2020 USD ($) tranche	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt instrument, face amount		$ 34,750,000,000		$ 34,750,000,000
Debt instrument, redemption price, percentage				100.00%
Debt instrument, change of control, redemption price, percent				101.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility		6,500,000,000		$ 6,500,000,000
5-year Back-up Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility		2,000,000,000.0		2,000,000,000.0	$ 2,000,000,000.0
Floating rate senior notes due March 2022
Debt Instrument [Line Items]
Debt instrument, face amount		$ 300,000,000		300,000,000
Senior Notes
Debt Instrument [Line Items]
Number of tranches | tranche		3	4
Debt issuance costs		$ 21,000,000	$ 36,000,000
Senior Notes | 0.90% Senior notes due March 2028
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500,000,000		$ 500,000,000
Debt instrument, interest rate, stated percentage		0.90%		0.90%
Unamortized discount		$ 3,000,000		$ 3,000,000
Senior Notes | 1.375% Senior notes due March 2031
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,250,000,000		$ 1,250,000,000
Debt instrument, interest rate, stated percentage		1.375%		1.375%
Unamortized discount		$ 7,000,000		$ 7,000,000
Senior Notes | 2.375% Senior notes due March 2051
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,250,000,000		$ 1,250,000,000
Debt instrument, interest rate, stated percentage		2.375%		2.375%
Unamortized discount		$ 17,000,000		$ 17,000,000
Senior Notes | 2.50% Senior notes due April 2027
Debt Instrument [Line Items]
Debt instrument, face amount			$ 750,000,000
Debt instrument, interest rate, stated percentage			2.50%
Unamortized discount			$ 4,000,000
Senior Notes | 2.70% Senior notes due April 2030
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,500,000,000
Debt instrument, interest rate, stated percentage			2.70%
Unamortized discount			$ 8,000,000
Senior Notes | 3.30% Senior notes due April 2040
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,250,000,000
Debt instrument, interest rate, stated percentage			3.30%
Unamortized discount			$ 11,000,000
Senior Notes | 3.35% Senior notes due April 2050
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,500,000,000
Debt instrument, interest rate, stated percentage			3.35%
Unamortized discount			$ 17,000,000
Senior Notes | 3.25% Senior notes due March 2022
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		3.25%		3.25%
Senior Notes | 5.875% Senior notes due December 2036
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		5.875%		5.875%
Senior Notes | 4.40% Senior notes due April 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		4.40%		4.40%
Repayments of debt		$ 1,000,000,000.0
Senior Notes | 2.00% Senior notes due April 2021 | Subsequent event
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.00%
Repayments of debt	$ 1,350,000,000

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