Debt Financing Arrangements (Long-Term Debt) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Aug. 11, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 24, 2015 USD ($)	Jun. 24, 2015 EUR (€)
Debt Instruments [Line Items]
Long-term Debt	$ 6,777			$ 5,791
Current maturities	(273)			(12)
Total long-term debt	6,504			5,779
Notes One Point Seventy Five Percent Due In Two Thousand Twenty-Three [Member]
Debt Instruments [Line Items]
Long-term Debt	$ 627			644
Debt Instrument, Face Amount		€ 600			$ 675	€ 600
Debt Instrument, Interest Rate, Stated Percentage	1.75%	1.75%			1.75%	1.75%
Debt instrument, maturity year	2023
Notes Two Point Five Percent Due in Two Thousand Twenty-Six [Member]
Debt Instruments [Line Items]
Long-term Debt	$ 991			0
Debt Instrument, Face Amount	$ 1,000		$ 1,000
Debt Instrument, Interest Rate, Stated Percentage	2.50%	2.50%	2.50%
Debt instrument, maturity year	2026
Notes Five Point Forty Five Percent Due in Two Thousand Eighteen [Member]
Debt Instruments [Line Items]
Long-term Debt	$ 560			561
Debt Instrument, Face Amount	$ 562
Debt Instrument, Interest Rate, Stated Percentage	5.45%	5.45%
Debt instrument, maturity year	2018
Floating Rate Notes Due In Two Thousand Nineteen [Member]
Debt Instruments [Line Items]
Long-term Debt	$ 526			541
Debt Instrument, Face Amount		€ 500			$ 563	€ 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	$ 510			516
Debt Instrument, Face Amount	$ 516
Debt Instrument, Interest Rate, Stated Percentage	4.479%	4.479%
Debt instrument, maturity year	2021
Debentures five point three seven five percent due in two thousand thirty five [Member}
Debt Instruments [Line Items]
Long-term Debt	$ 459			459
Debt Instrument, Face Amount	$ 470
Debt Instrument, Interest Rate, Stated Percentage	5.375%	5.375%
Debt instrument, maturity year	2035
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	$ 378			377
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	$ 380			377
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	$ 377			374
Debt Instrument, Face Amount	$ 528
Debt Instrument, Interest Rate, Stated Percentage	4.535%	4.535%
Debt instrument, maturity year	2042
Debentures eight point three seven five percent due in two thousand seventeen [ Member]
Debt Instruments [Line Items]
Long-term Debt	$ 260			260
Debt Instrument, Face Amount	$ 261
Debt Instrument, Interest Rate, Stated Percentage	8.375%	8.375%
Debt instrument, maturity year	2017
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	$ 149			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	$ 125			125
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	$ 463			$ 436