Guarantor Financial Information (Narrative) (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
6.875% Senior Notes Due 2018 [Member]
Debt instrument, interest rate	6.875%	6.875%
2.875% Senior Notes Due 2019 [Member]
Debt instrument, interest rate	2.875%	2.875%
4.250% Senior Notes Due 2013 [Member]
Debt instrument, interest rate	4.25%	4.25%
5.750% Senior Notes Due 2043 [Member]
Debt instrument, interest rate	5.75%	5.75%
9.00% Debentures Due 2021 [Member]
Debt instrument, interest rate	9.00%	9.00%
7.20% Debentures Due 2014-2025 [Member]
Debt instrument, interest rate	7.20%	7.20%
6.48% Debentures Due 2025 [Member]
Debt instrument, interest rate	6.48%	6.48%
6.625% Percent Senior Notes Due Two Thousand Twenty [Member]
Debt instrument, interest rate	2.625%	2.625%
2.625 Percent Notes Due 2020 [Member]
Debt instrument, interest rate	2.625%
3.55% Senior Notes due 2024 [Member]
Debt instrument, interest rate	3.55%	3.55%
4.650% Percent Senior Notes due Twenty Forty Four [Member]
Debt instrument, interest rate	4.65%	4.65%
Subsidiary Of Lux International [Member] | Irish Holdings [Member]
Due to Related Parties	$ 6.2
Lux International [Member] | Irish Holdings [Member]
Intercompany note payable	19.5
Due to Related Parties	$ 6.4
Lux International [Member] | International Holdings [Member]
Intercompany note payable		$ 19.5