Debt Financing Arrangements (Long-Term Debt) (Details) € in Millions, $ in Millions				12 Months Ended
	Jun. 24, 2019 EUR (€)	Dec. 03, 2018 EUR (€)	Sep. 12, 2018 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)
Debt Instruments [Line Items]
Document Period End Date				Dec. 31, 2019
Long-term Debt				$ 7,679		$ 8,280
Current maturities				(7)		(582)
Total long-term debt				7,672		7,698
Notes One Point Seventy Five Percent Due In Two Thousand Twenty-Three [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 669		682
Debt Instrument, Face Amount | €					€ 600
Debt Instrument, Interest Rate, Stated Percentage				1.75%	1.75%
Debt instrument, maturity year				2023
Notes Four Point Five Percent due Two Thousand Forty-Nine [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 587		587
Debt Instrument, Face Amount | €		€ 600			€ 600
Debt Instrument, Interest Rate, Stated Percentage		4.50%		4.50%	4.50%
Debt instrument, maturity year		2049		2049
Notes Two Point Five Percent Due in Two Thousand Twenty-Six [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 994		993
Debt Instrument, Face Amount				$ 1,000
Debt Instrument, Interest Rate, Stated Percentage				2.50%	2.50%
Debt instrument, maturity year				2026
Notes One Percent Due in Two Thousand Twenty-Five [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 723		736
Debt Instrument, Face Amount			€ 650	$ 744	€ 650
Debt Instrument, Interest Rate, Stated Percentage			1.00%	1.00%	1.00%
Debt instrument, maturity year			2025	2025
Floating Rate Notes Due In Two Thousand Nineteen [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 0		572
Debt Instrument, Face Amount | €	€ 500				€ 500
Debt instrument, maturity year	2019
Debentures four point four seven nine percent due in two thousand twenty one [Member]
Debt Instruments [Line Items]
Long-term Debt				500		493
Debt Instrument, Face Amount				$ 516
Debt Instrument, Interest Rate, Stated Percentage				4.479%	4.479%
Debt instrument, maturity year				2021
Notes Three Point Seventy-Five Percent Due in Two Thousand Forty-Seven [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 493		493
Debt Instrument, Face Amount				$ 500
Debt Instrument, Interest Rate, Stated Percentage				3.75%	3.75%
Debt instrument, maturity year				2047
Debentures five point three seven five percent due in two thousand thirty five [Member}
Debt Instruments [Line Items]
Long-term Debt				$ 461		461
Debt Instrument, Face Amount				$ 470
Debt Instrument, Interest Rate, Stated Percentage				5.375%	5.375%
Debt instrument, maturity year				2035
Notes Three Point Three Hundred Seventy-Five Percent due in Two Thousand Twenty-Two [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 398		398
Debt Instrument, Face Amount | €		€ 400			€ 400
Debt Instrument, Interest Rate, Stated Percentage		3.375%		3.375%	3.375%
Debt instrument, maturity year		2022		2022
Debentures five point seven six five percent due in two thousand forty one [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 378		378
Debt Instrument, Face Amount				$ 378
Debt Instrument, Interest Rate, Stated Percentage				5.765%	5.765%
Debt instrument, maturity year				2041
Debentures five point nine three five percent due in two thousand thirty two [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 379		378
Debt Instrument, Face Amount				$ 383
Debt Instrument, Interest Rate, Stated Percentage				5.935%	5.935%
Debt instrument, maturity year				2032
Debentures four point zero one six percent due in two thousand forty three [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 389		386
Debt Instrument, Face Amount				$ 570
Debt Instrument, Interest Rate, Stated Percentage				4.016%	4.016%
Debt instrument, maturity year				2043
Debentures four point five three five percent due in two thousand forty two [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 384		382
Debt Instrument, Face Amount				$ 528
Debt Instrument, Interest Rate, Stated Percentage				4.535%	4.535%
Debt instrument, maturity year				2042
Debentures seven percent due in two thousand thirty one [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 163		163
Debt Instrument, Face Amount				$ 164
Debt Instrument, Interest Rate, Stated Percentage				7.00%	7.00%
Debt instrument, maturity year				2031
Debentures six point six two five percent due in two thousand twenty nine [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 159		159
Debt Instrument, Face Amount				$ 160
Debt Instrument, Interest Rate, Stated Percentage				6.625%	6.625%
Debt instrument, maturity year				2029
Debentures six point ninety-five due in two thousand ninety seven [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 155		155
Debt Instrument, Face Amount				$ 159
Debt Instrument, Interest Rate, Stated Percentage				6.95%	6.95%
Debt instrument, maturity year				2097
Debentures seven point five percent due in two thousand twenty seven [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 150		149
Debt Instrument, Face Amount				$ 150
Debt Instrument, Interest Rate, Stated Percentage				7.50%	7.50%
Debt instrument, maturity year				2027
Debentures six point forty-five percent due in two thousand thirty eight [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 126		126
Debt Instrument, Face Amount				$ 127
Debt Instrument, Interest Rate, Stated Percentage				6.45%	6.45%
Debt instrument, maturity year				2038
Debentures six point seventy-five percent due in two thousand twenty seven [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 117		117
Debt Instrument, Face Amount				$ 118
Debt Instrument, Interest Rate, Stated Percentage				6.75%	6.75%
Debt instrument, maturity year				2027
Other [Member]
Debt Instruments [Line Items]
Long-term Debt				$ 454		$ 472