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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 42 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by operating activities $ 2,715 $ 2,901 $ 2,884  
Net Cash Provided by (Used in) Investing Activities [Abstract]        
Proceeds from asset sales, net of expenses 62 46 117  
(Increase) decrease in restricted cash 44 (15) (223)  
(Purchase) sale of short term investments, net (7) (20) (3,562)  
Net cash used in investing activities (1,774) (895) (4,906)  
Financing Activities:        
Borrowings (payments) under the revolver, net (22) (321) 437  
Purchase of treasury stock (322) (301) (279) (1,100)
Common stock dividends paid (119) (30) 0  
Payments for deferred financing costs (176) (40) (202)  
Net cash (used in) provided by financing activities (1,136) (1,867) 1,412  
Effect of exchange rate changes on cash (59) 5 (122)  
Total increase (decrease) in cash and cash equivalents (258) 276 (736)  
Cash and cash equivalents, beginning 1,900 1,624 2,360  
Cash and cash equivalents, ending 1,642 1,900 1,624 1,642
SUPPLEMENTAL DISCLOSURES:        
Cash payments for interest, net of amounts capitalized 1,398 1,509 1,442  
Cash payments for income taxes, net of refunds 570 647 971  
Parent Company
        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by operating activities 418 694 719  
Net Cash Provided by (Used in) Investing Activities [Abstract]        
Proceeds from asset sales, net of expenses (5) 0 0  
Investment in and net advances to subsidiaries 201 (168) (2,655)  
Return of capital 230 660 304  
(Increase) decrease in restricted cash 50 44 (261)  
Additions to property, plant and equipment (11) (24) (28)  
(Purchase) sale of short term investments, net 1 1 2  
Net cash used in investing activities 466 513 (2,638)  
Financing Activities:        
Borrowings (payments) under the revolver, net 0 (295) 295  
Borrowings of notes payable and other coupon bearing securities 750 0 2,050  
Repayments of notes payable and other coupon bearing securities (1,210) (236) (477)  
Loans (to) from subsidiaries (152) (236) (5)  
Purchase of treasury stock (322) (301) (279)  
Proceeds from issuance of common stock 13 8 4  
Common stock dividends paid (119) (30) 0  
Payments for deferred financing costs (17) (1) (75)  
Net cash (used in) provided by financing activities (1,057) (1,091) 1,513  
Effect of exchange rate changes on cash (1) 0 1  
Total increase (decrease) in cash and cash equivalents (174) 116 (405)  
Cash and cash equivalents, beginning 305 189 594  
Cash and cash equivalents, ending 131 305 189 131
SUPPLEMENTAL DISCLOSURES:        
Cash payments for interest, net of amounts capitalized 442 479 392  
Cash payments for income taxes, net of refunds $ 11 $ 0 $ (6)