Income Taxes (Summary of Operating Loss And Tax Credit Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	$ 1,321
Two Thousand Fourteen Through Two Thousand Twenty Three [Member]
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	313
Two Thousand Twenty Four Through Two Thousand Thirty Three [Member]
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	154
Indefinite Life [Member]
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	854
U.S. Federal, Non-U.S. and State and Local Jurisdiction [Member] | General Business Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	602
U.S. Federal, Non-U.S. and State and Local Jurisdiction [Member] | Two Thousand Fourteen Through Two Thousand Twenty Three [Member] | General Business Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	117
U.S. Federal, Non-U.S. and State and Local Jurisdiction [Member] | Two Thousand Twenty Four Through Two Thousand Thirty Three [Member] | General Business Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	31
U.S. Federal, Non-U.S. and State and Local Jurisdiction [Member] | Indefinite Life [Member] | General Business Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	454
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	272
State and Local Jurisdiction [Member] | Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	23
State and Local Jurisdiction [Member] | Two Thousand Fourteen Through Two Thousand Twenty Three [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	152
State and Local Jurisdiction [Member] | Two Thousand Fourteen Through Two Thousand Twenty Three [Member] | Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	23
State and Local Jurisdiction [Member] | Two Thousand Twenty Four Through Two Thousand Thirty Three [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	120
State and Local Jurisdiction [Member] | Two Thousand Twenty Four Through Two Thousand Thirty Three [Member] | Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0
State and Local Jurisdiction [Member] | Indefinite Life [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
State and Local Jurisdiction [Member] | Indefinite Life [Member] | Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0
U.S. Federal and Non-U.S. Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	424
U.S. Federal and Non-U.S. Jurisdiction [Member] | Two Thousand Fourteen Through Two Thousand Twenty Three [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	21
U.S. Federal and Non-U.S. Jurisdiction [Member] | Two Thousand Twenty Four Through Two Thousand Thirty Three [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	3
U.S. Federal and Non-U.S. Jurisdiction [Member] | Indefinite Life [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 400