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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash paid during the year      
Interest—net of interest capitalized $ 176 $ 184 $ 228
Income taxes—net of refunds 430 111 (41)
Supplemental disclosure of noncash investing and financing activities:      
Change in capitalized expenditures in accounts payable and accrued expenses (8) 1 (6)
Change in accrued share repurchases $ (1) $ 0 $ (33)