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Schedule I - Condensed Financial Information of Parent (Statement of Cash Flows) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities $ 2,489 $ 2,884 $ 2,134
Investing Activities:      
Decrease in restricted cash (135) (61) (159)
Purchase of short term investments, net (625) (55) (17)
Net cash used in investing activities (2,749) (2,108) (2,366)
Financing Activities:      
Borrowings under the revolver, net 2,156 1,465 959
Purchase of treasury stock 0 (79) (482)
Common stock dividends paid (317) (290) (276)
Payments for deferred financing costs (100) (105) (90)
Payments to Noncontrolling Interests (424) (476) (326)
Proceeds from (Payments for) Other Financing Activities (52) (44) (7)
Net cash provided by (used in) financing activities 43 (747) 28
Effect of exchange rate changes on cash 3 9 (52)
Total increase (decrease) in cash and cash equivalents (295) 26 (231)
Cash and cash equivalents, beginning 1,244 1,218  
Cash and cash equivalents, ending 949 1,244 1,218
SUPPLEMENTAL DISCLOSURES:      
Cash payments for interest, net of amounts capitalized (1,196) (1,273) (1,265)
Cash payments for income taxes, net of refunds (377) (487) (388)
Parent Company [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities 148 818 475
Investing Activities:      
Investment in and net advances to subsidiaries (339) (650) (221)
Return of capital 243 247 501
Decrease in restricted cash 3 29 49
Additions to property, plant and equipment (13) (12) (11)
Net cash used in investing activities (106) (386) 318
Financing Activities:      
Borrowings under the revolver, net 207 0 0
Borrowings of notes payable and other coupon bearing securities 1,025 500 575
Repayments of notes payable and other coupon bearing securities (1,353) (808) (915)
Loans from subsidiaries 309 183 0
Purchase of treasury stock 0 (79) (482)
Proceeds from issuance of common stock 1 1 4
Common stock dividends paid (317) (290) (276)
Payments for deferred financing costs (12) (12) (6)
Payments to Noncontrolling Interests 0 (2) 0
Proceeds from (Payments for) Other Financing Activities (7) (3) (18)
Net cash provided by (used in) financing activities (147) (510) (1,118)
Effect of exchange rate changes on cash 6 1 0
Total increase (decrease) in cash and cash equivalents (99) (77) (325)
Cash and cash equivalents, beginning 109 186 511
Cash and cash equivalents, ending 10 109 186
SUPPLEMENTAL DISCLOSURES:      
Cash payments for interest, net of amounts capitalized 282 296 314
Cash payments for income taxes, net of refunds $ 2 $ 6 $ 0