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Debt and Credit Facilities (Narrative) (Details)	1 Months Ended				12 Months Ended
Debt and Credit Facilities (Narrative) (Details)	Jan. 31, 2020 USD ($) Rate	Dec. 31, 2019 EUR (€) Rate	Mar. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019	Dec. 31, 2019 Rate
Line of Credit Facility [Line Items]
Commercial Paper					$ 0
Interest expense, debt					287,000,000	$ 264,000,000	$ 247,000,000
Senior Unsecured Notes 1.800% due 2019
Line of Credit Facility [Line Items]
Repaid face amount				$ 500,000,000
Stated interest rate \| Rate									1.80%
Senior Unsecured Notes 2.000% due 2019
Line of Credit Facility [Line Items]
Repaid face amount			$ 750,000,000
Stated interest rate								2.00%	2.00%
Senior Unsecured Notes 0.250% due 2024
Line of Credit Facility [Line Items]
Stated interest rate								0.25%	0.25%
Proceeds from issuance of debt \| €		€ 850,000,000
Redemption price percentage \| Rate		101.00%
Senior Unsecured Notes 4.375% Due 2020
Line of Credit Facility [Line Items]
Stated interest rate								4.375%
Senior Unsecured Notes 4.375% Due 2020 \| Subsequent Event
Line of Credit Facility [Line Items]
Repaid face amount	$ 500,000,000
Stated interest rate \| Rate	4.375%
Senior Unsecured Notes 0.750% due 2029
Line of Credit Facility [Line Items]
Stated interest rate								0.75%	0.75%
Proceeds from issuance of debt \| €		€ 800,000,000
Senior Unsecured Notes 1.000% due 2031
Line of Credit Facility [Line Items]
Stated interest rate								1.00%	1.00%
Proceeds from issuance of debt \| €		€ 750,000,000
Redemption price percentage		101.00%
Senior Unsecured Notes, Due November 2023
Line of Credit Facility [Line Items]
Stated interest rate								1.125%
Senior Unsecured Notes, Due November 2027
Line of Credit Facility [Line Items]
Stated interest rate								2.125%
Senior Unsecured Notes, Due November 2030
Line of Credit Facility [Line Items]
Stated interest rate								2.625%
Commercial Paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 1,500,000,000
Maturities of time deposits					397 days