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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities $ (1,902) $ (2,755) $ (2,466)
Investing Activities:      
Sale of short-term investments 616 627 666
Net cash used in investing activities (3,051) (2,295) (2,721)
Financing Activities:      
Common stock dividends paid (401) (381) (362)
Payments for deferred financing costs (32) (107) (126)
Proceeds from (Payments for) Other Financing Activities (45) (53) (8)
Net cash provided by (used in) financing activities 797 (78) (86)
Effect of exchange rate changes on cash (46) (24) (18)
Cash and cash equivalents, beginning 1,089    
Cash and cash equivalents, ending 943 1,089  
SUPPLEMENTAL DISCLOSURES:      
Cash payments for interest, net of amounts capitalized (815) (908) (946)
Cash payments for income taxes, net of refunds (459) (333) (363)
Issuance of preferred stock 1,014 0 0
Sales to noncontrolling interests 173 553 128
Parent Company [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities (570) (434) 583
Investing Activities:      
Proceeds from the sale of business interests, net of expenses 64 412 196
Investment in and net advances to subsidiaries (2,260) (652) (596)
Return of capital 698 346 411
Additions to property, plant and equipment (14) (8) (8)
Sale of short-term investments 0 (1) 0
Net cash used in investing activities (1,512) 97 3
Financing Activities:      
(Repayments) Borrowings under the revolver, net 295 (110) 180
Borrowings of notes payable and other coupon bearing securities 0 3,397 0
Repayments of notes payable and other coupon bearing securities 0 (3,366) (450)
Loans from (Repayments to) subsidiaries 0 25 40
Proceeds from issuance of common stock 8 4 6
Common stock dividends paid (401) (381) (362)
Payments for deferred financing costs (4) (38) (3)
Proceeds from (Payments for) Other Financing Activities 1 (3) (4)
Net cash provided by (used in) financing activities 912 (472) (593)
Effect of exchange rate changes on cash 0 0 (1)
Total increase (decrease) in cash, cash equivalents and restricted cash (30) 59 (8)
Cash and cash equivalents, beginning 70 11  
Cash and cash equivalents, ending 40 70 11
SUPPLEMENTAL DISCLOSURES:      
Cash payments for interest, net of amounts capitalized 79 156 192
Cash payments for income taxes, net of refunds 0 (8) (5)
Issuance of preferred stock 1,014 0 0
Sales to noncontrolling interests $ (1) $ 0 $ 0