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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Liabilities:    
Restricted cash equivalents $ 9 $ 9
Recurring Basis [Member]    
Assets:    
Cash equivalents 82 71
Restricted cash equivalents 10 12
Interest rate contracts 13 24
Total assets 105 107
Liabilities:    
Interest rate contracts 698 116
Total liabilities 698 116
Recurring Basis [Member] | Level 1 [Member]    
Assets:    
Cash equivalents 82 71
Restricted cash equivalents 10 12
Interest rate contracts 0 0
Total assets 92 83
Liabilities:    
Interest rate contracts 0 0
Total liabilities 0 0
Recurring Basis [Member] | Level 2 [Member]    
Assets:    
Cash equivalents 0 0
Restricted cash equivalents 0 0
Interest rate contracts 13 24
Total assets 13 24
Liabilities:    
Interest rate contracts 698 116
Total liabilities $ 698 $ 116