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Schedule I - CONDENSED STATEMENT OF CASH FLOWS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]      
Cash flows provided by/(used in) operating activities $ 1,007 $ 786 $ (2,323)
Cash flows from investing activities      
Payments to acquire investments (13) (22) (12)
Proceeds from the sale and maturity of investments 32 43 33
Cash flows used in investing activities (328) (2,135) (55)
Cash flows from financing activities      
Debt issuance and extension costs and fees (28) (5) (288)
Repayments of long-term debt (414) (1,130) (7,846)
Taxes paid related to net share settlement of equity awards (28) (22) (11)
Proceeds from the issuance of common stock 47 6 11
Repurchase of common stock 0 (311) 0
Cash flows provided by/(used in) financing activities (446) 297 429
Net increase/(decrease) in cash, cash equivalents, and restricted cash 227 (1,052) (1,949)
Cash, cash equivalents, and restricted cash, beginning of period 1,657 2,709 4,658
Cash, cash equivalents, and restricted cash, end of period 1,884 1,657 2,709
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Cash flows provided by/(used in) operating activities (281) (138) 1,504
Cash flows from investing activities      
Payments to acquire investments 0 0 (700)
Proceeds from the sale and maturity of investments 17 0 0
Cash flows used in investing activities 17 0 (700)
Cash flows from financing activities      
Debt issuance and extension costs and fees (28) 0 0
Repayments of long-term debt 0 (2) 0
Taxes paid related to net share settlement of equity awards (28) (22) 0
Proceeds from the issuance of common stock 47 6 0
Repurchase of common stock 0 (311) 0
Other financing 0 (2) 0
Cash flows provided by/(used in) financing activities (9) (331) 0
Net increase/(decrease) in cash, cash equivalents, and restricted cash (273) (469) 804
Cash, cash equivalents, and restricted cash, beginning of period 457 926 122
Cash, cash equivalents, and restricted cash, end of period $ 184 $ 457 $ 926