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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Cash Flows [Abstract]    
Net cash provided by (used in) operating activities $ 409 $ 462
Cash flows from investing activities    
Sales, maturities and repayments of fixed maturity securities 4,014 3,183
Sales, maturities and repayments of equity securities 5 25
Sales, maturities and repayments of mortgage loans 169 125
Sales, maturities and repayments of real estate and real estate joint ventures 74 11
Sales, maturities and repayments of other limited partnership interests 42 110
Purchases of fixed maturity securities (3,767) (2,502)
Purchases of equity securities (1) (3)
Purchases of mortgage loans (739) (588)
Purchases of real estate and real estate joint ventures (15) (35)
Purchases of other limited partnership interests (38) (57)
Cash received in connection with freestanding derivatives 711 1,307
Cash paid in connection with freestanding derivatives (1,413) (1,850)
Net change in policy loans (1) 3
Net change in short-term investments 54 298
Net change in other invested assets 23 13
Net cash provided by (used in) investing activities (882) 40
Cash flows from financing activities    
Policyholder account balances: Deposits 1,364 1,008
Policyholder account balances: Withdrawals (750) (988)
Net change in payables for collateral under securities loaned and other transactions 80 (136)
Long-term debt repaid (3) (3)
Financing element on certain derivative instruments and other derivative related transactions, net (157) 224
Other, net (13) 0
Net cash provided by (used in) financing activities 521 105
Change in cash, cash equivalents and restricted cash 48 607
Cash, cash equivalents and restricted cash, beginning of period 1,363 5,057
Cash, cash equivalents and restricted cash, end of period 1,411 5,664
Supplemental disclosures of cash flow information    
Net cash paid (received) for interest 0 30
Net cash paid (received) for income tax 0 1
Non-cash transactions:    
Transfer of fixed maturity securities to former affiliates 0 293
Reduction of policyholder account balances in connection with reinsurance transactions $ 0 $ 293