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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities $ 2,466 $ 2,343 $ 2,504
Investing Activities:      
Purchase of short term investments, net (192) (66) (609)
Net cash used in investing activities (2,721) (505) (2,599)
Financing Activities:      
(Repayments) Borrowings under the revolver, net 2,026 1,865 2,156
Common stock dividends paid (362) (344) (317)
Payments for deferred financing costs (126) (39) (100)
Payments to Noncontrolling Interests (427) (340) (424)
Proceeds from (Payments for) Other Financing Activities 120 101 42
Net cash provided by (used in) financing activities (86) (1,643) 43
Effect of exchange rate changes on cash (18) (54) 8
Cash and cash equivalents, beginning 1,166    
Cash and cash equivalents, ending 1,029 1,166  
SUPPLEMENTAL DISCLOSURES:      
Cash payments for interest, net of amounts capitalized (946) (1,003) (1,196)
Cash payments for income taxes, net of refunds (363) (370) (377)
Parent Company [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities 583 409 148
Investing Activities:      
Proceeds from the sale of business interests, net of expenses 196 1,222 0
Investment in and net advances to subsidiaries (596) (216) (339)
Return of capital 411 242 243
Additions to property, plant and equipment (8) (13) (13)
Net cash used in investing activities 3 1,235 (109)
Financing Activities:      
(Repayments) Borrowings under the revolver, net 180 (207) 207
Borrowings of notes payable and other coupon bearing securities 0 1,000 1,025
Repayments of notes payable and other coupon bearing securities (450) (1,933) (1,353)
Loans from (Repayments to) subsidiaries 40 (143) 309
Proceeds from issuance of common stock 6 7 1
Common stock dividends paid (362) (344) (317)
Payments for deferred financing costs (3) (11) (12)
Proceeds from (Payments for) Other Financing Activities (4) (5) (7)
Net cash provided by (used in) financing activities (593) (1,636) (147)
Effect of exchange rate changes on cash (1) 1 6
Total increase (decrease) in cash, cash equivalents and restricted cash (8) 9 (102)
Cash and cash equivalents, beginning 19 10  
Cash and cash equivalents, ending 11 19 10
SUPPLEMENTAL DISCLOSURES:      
Cash payments for interest, net of amounts capitalized 192 232 282
Cash payments for income taxes, net of refunds $ (5) $ 10 $ 2