Indebtedness (Debt Issuances Outstanding) (Details)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 EUR (€)
US Dollar Notes [Member] | Floating Rate US Dollar Notes Due February 2020 [Member]
Debt Instrument [Line Items]
Face Value	$ 300,000,000
US Dollar Notes [Member] | 2.000% US Dollar Notes Due February 2020 [Member]
Debt Instrument [Line Items]
Face Value	$ 1,000,000,000
Interest Rate	2.00%	2.00%	2.00%
US Dollar Notes [Member] | 4.500% US Dollar Notes Due March 2020 [Member]
Debt Instrument [Line Items]
Face Value	$ 1,000,000,000
Interest Rate	4.50%	4.50%	4.50%
US Dollar Notes [Member] | 1.875% US Dollar Notes Due February 2021 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	1.875%	1.875%	1.875%
US Dollar Notes [Member] | 4.125% US Dollar Notes Due May 2021 [Member]
Debt Instrument [Line Items]
Face Value	$ 350,000,000
Interest Rate	4.125%	4.125%	4.125%
US Dollar Notes [Member] | 2.900% US Dollar Notes Due November 2021 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	2.90%	2.90%	2.90%
US Dollar Notes [Member] | 2.625% US Dollar Notes Due February 2022 [Member]
Debt Instrument [Line Items]
Face Value	$ 500,000,000
Interest Rate	2.625%	2.625%	2.625%
US Dollar Notes [Member] | 2.375% US Dollar Notes Due August 2022 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	2.375%	2.375%	2.375%
US Dollar Notes [Member] | 2.500% US Dollar Notes Due August 2022 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	2.50%	2.50%	2.50%
US Dollar Notes [Member] | 2.500% US Dollar Notes Due November 2022 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	2.50%	2.50%	2.50%
US Dollar Notes [Member] | 2.625% US Dollar Notes Due March 2023 [Member]
Debt Instrument [Line Items]
Face Value	$ 600,000,000
Interest Rate	2.625%	2.625%	2.625%
US Dollar Notes [Member] | 2.125% US Dollar Notes Due May 2023 [Member]
Debt Instrument [Line Items]
Face Value	$ 500,000,000
Interest Rate	2.125%	2.125%	2.125%
US Dollar Notes [Member] | 3.600% US Dollar Notes Due November 2023 [Member]
Debt Instrument [Line Items]
Face Value	$ 500,000,000
Interest Rate	3.60%	3.60%	3.60%
US Dollar Notes [Member] | 2.875% US Dollar Notes Due May 2024 [Member]
Debt Instrument [Line Items]
Face Value	$ 900,000,000
Interest Rate	2.875%	2.875%	2.875%
US Dollar Notes [Member] | 3.250% US Dollar Notes Due November 2024 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	3.25%	3.25%	3.25%
US Dollar Notes [Member] | 3.375% US Dollar Notes Due August 2025 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	3.375%	3.375%	3.375%
US Dollar Notes [Member] | 2.750% US Dollar Notes Due February 2026 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	2.75%	2.75%	2.75%
US Dollar Notes [Member] | 3.125% US Dollar Notes Due August 2027 [Member]
Debt Instrument [Line Items]
Face Value	$ 500,000,000
Interest Rate	3.125%	3.125%	3.125%
US Dollar Notes [Member] | 3.125% US Dollar Notes Due March 2028 [Member]
Debt Instrument [Line Items]
Face Value	$ 500,000,000
Interest Rate	3.125%	3.125%	3.125%
US Dollar Notes [Member] | 3.600 % US Dollar Notes Due August 2029 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	3.375%	3.375%	3.375%
US Dollar Notes [Member] | 6.375% US Dollar Notes Due May 2038 [Member]
Debt Instrument [Line Items]
Face Value	$ 1,500,000,000
Interest Rate	6.375%	6.375%	6.375%
US Dollar Notes [Member] | 4.375% US Dollar Notes Due November 2041 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	4.375%	4.375%	4.375%
US Dollar Notes [Member] | 4.500% US Dollar Notes Due March 2042 [Member]
Debt Instrument [Line Items]
Face Value	$ 700,000,000
Interest Rate	4.50%	4.50%	4.50%
US Dollar Notes [Member] | 3.875% US Dollar Notes Due August 2042 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	3.875%	3.875%	3.875%
US Dollar Notes [Member] | 4.125% US Dollar Notes Due March 2043 [Member]
Debt Instrument [Line Items]
Face Value	$ 850,000,000
Interest Rate	4.125%	4.125%	4.125%
US Dollar Notes [Member] | 4.875% US Dollar Notes Due November 2043 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	4.875%	4.875%	4.875%
US Dollar Notes [Member] | 4.250% US Dollar Notes Due November 2044 [Member]
Debt Instrument [Line Items]
Face Value	$ 750,000,000
Interest Rate	4.25%	4.25%	4.25%
US Dollar Notes [Member] | 4.250% US Dollar Notes Issued May 2016 Due November 2044 [Member]
Debt Instrument [Line Items]
Face Value	$ 500,000,000
Interest Rate	4.25%	4.25%	4.25%
Foreign Currency Obligations [Member] | 1.750% Euro Notes Due March 2020 [Member]
Debt Instrument [Line Items]
Face Value	$ 1,621,000,000		€ 1,250,000,000
Interest Rate	1.75%	1.75%	1.75%
Foreign Currency Obligations [Member] | 1.875% Euro Notes Due March 2021 [Member]
Debt Instrument [Line Items]
Face Value	$ 1,029,000,000		€ 750,000,000
Interest Rate	1.875%	1.875%	1.875%
Foreign Currency Obligations [Member] | 2.875% Euro Notes Due May 2024 [Member]
Debt Instrument [Line Items]
Face Value	$ 761,000,000		€ 600,000,000
Interest Rate	2.875%	2.875%	2.875%
Foreign Currency Obligations [Member] | 0.625% Euro Notes Due November 2024 [Member]
Debt Instrument [Line Items]
Face Value	$ 582,000,000		€ 500,000,000
Interest Rate	0.625%	0.625%	0.625%
Foreign Currency Obligations [Member] | 2.750% Euro Notes Due March 2025 [Member]
Debt Instrument [Line Items]
Face Value	$ 972,000,000		€ 750,000,000
Interest Rate	2.75%	2.75%	2.75%
Foreign Currency Obligations [Member] | 2.875% Euro Notes Due March 2026 [Member]
Debt Instrument [Line Items]
Face Value	$ 1,372,000,000		€ 1,000,000,000
Interest Rate	2.875%	2.875%	2.875%
Foreign Currency Obligations [Member] | 0.125% Euro Notes Due August 2026 [Member]
Debt Instrument [Line Items]
Face Value	$ 557,000,000		€ 500,000,000
Interest Rate	0.125%	0.125%	0.125%
Foreign Currency Obligations [Member] | 2.875% Euro Notes Due May 2029 [Member]
Debt Instrument [Line Items]
Face Value	$ 697,000,000		€ 500,000,000
Interest Rate	2.875%	2.875%	2.875%
Foreign Currency Obligations [Member] | 0.800% Euro Notes Due August 2031 [Member]
Debt Instrument [Line Items]
Face Value	$ 835,000,000		€ 750,000,000
Interest Rate	0.80%	0.80%	0.80%
Foreign Currency Obligations [Member] | 3.125% Euro Notes Due June 2033 [Member]
Debt Instrument [Line Items]
Face Value	$ 648,000,000		€ 500,000,000
Interest Rate	3.125%	3.125%	3.125%
Foreign Currency Obligations [Member] | 2.000% Euro Notes Due May 2036 [Member]
Debt Instrument [Line Items]
Face Value	$ 578,000,000		€ 500,000,000
Interest Rate	2.00%	2.00%	2.00%
Foreign Currency Obligations [Member] | 1.875% Euro Notes Due November 2037 [Member]
Debt Instrument [Line Items]
Face Value	$ 582,000,000		€ 500,000,000
Interest Rate	1.875%	1.875%	1.875%
Foreign Currency Obligations [Member] | 1.450% Euro Notes Due August 2039 [Member]
Debt Instrument [Line Items]
Face Value	$ 835,000,000		€ 750,000,000
Interest Rate	1.45%	1.45%	1.45%
Foreign Currency Obligations [Member] | 1.000% Swiss Franc Notes Due September 2020 [Member]
Debt Instrument [Line Items]
Face Value	$ 334,000,000	SFr 325,000,000
Interest Rate	1.00%	1.00%	1.00%
Foreign Currency Obligations [Member] | 2.000% Swiss Franc Notes Due December 2021 [Member]
Debt Instrument [Line Items]
Face Value	$ 335,000,000	SFr 300,000,000
Interest Rate	2.00%	2.00%	2.00%
Foreign Currency Obligations [Member] | 1.625% Swiss Franc Notes Due May 2024 [Member]
Debt Instrument [Line Items]
Face Value	$ 283,000,000	SFr 250,000,000
Interest Rate	1.625%	1.625%	1.625%